nslookup unrecognized command nslookup unrecognized command

Run this command over and over to see the TTL going down until it hits zero, and then it'll restart for the refreshed result. Alternatively, you can also view installed apps by accessing Apps and Features in Settings. Now, the NSLookup unknown: cannot find non-existent domain no longer exist. What are Active Directory Global Catalog Servers. I can ping X.X.X.X directly (and 23.72..170, which is www.cisco.com ) On the LAN side, the PCs are provided with the same dns server (X.X.X.X), and name-resolution seems to be working there, so the router is letting dns queries through, but doesn't seem to be able to use the name server . % Unrecognized host or address, or protocol not running. Nslookup | Microsoft Learn We're no longer updating this content regularly. What's the difference between a power rail and a signal line? For that purpose, we need a reverse DNS lookup. Forward lookup zones resolve names to IP addresses and Reverse lookup zones resolve IP addresses to names. The Web doesn't have its own transport system. {"@type":"Person","@id":"https://www.cloudns.net/blog/author/jag/#author","name":"Boyan Peychev","image":{"@type":"ImageObject","@id":"https://www.cloudns.net/blog/#personlogo","url":"https://secure.gravatar.com/avatar/62433fff3c5e972c2f73c402a4120463?s=96&d=mm&r=g","caption":"Boyan Peychev"},"description":"Boyan Peychev is Founder and CEO of ClouDNS.","sameAs":[]}]}. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Interactive mode actually launches the Nslookup utility as a separate application, complete with its own prompt. but I would think I would have gotten a 2FA notification and see an unrecognized device listed if that were the case. Mutually exclusive execution using std::atomic? This tool is installed at the time that TCP/IP is installed on the computer. Also ensure the correct dns setting on DC as below. 9. "},{"@type":"Article","@id":"https://www.cloudns.net/blog/10-most-used-nslookup-commands/#article","isPartOf":{"@id":"https://www.cloudns.net/blog/10-most-used-nslookup-commands/#webpage"},"author":{"@id":"https://www.cloudns.net/blog/author/jag/#author","name":"Boyan Peychev"},"publisher":{"@id":"https://www.cloudns.net/blog/#organization"},"headline":"10 most used Nslookup commands","datePublished":"2018-10-09T13:33:30+00:00","dateModified":"2019-05-16T12:26:55+00:00","commentCount":0,"mainEntityOfPage":"https://www.cloudns.net/blog/10-most-used-nslookup-commands/#webpage", "image" : [ "https://www.cloudns.net/blog/wp-content/uploads/2018/10/1.png", "https://www.cloudns.net/blog/wp-content/uploads/2018/10/2.png", "https://www.cloudns.net/blog/wp-content/uploads/2018/10/3.png", "https://www.cloudns.net/blog/wp-content/uploads/2018/10/4.png", "https://www.cloudns.net/blog/wp-content/uploads/2018/10/5.png", "https://www.cloudns.net/blog/wp-content/uploads/2018/10/6.png", "https://www.cloudns.net/blog/wp-content/uploads/2018/10/7.png", "https://www.cloudns.net/blog/wp-content/uploads/2018/10/8.png", "https://www.cloudns.net/blog/wp-content/uploads/2018/10/9.png", "https://www.cloudns.net/blog/wp-content/uploads/2018/10/10.png" ], "keywords":"DNS,nslookup,nslookup cmd,nslookup command,nslookup command example,nslookup commands","articleSection":"DNS"}, You can manually choose the timeout time in seconds. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Enjoy this article? --Check the DNS setting on the Server it should point to itself(assuming that dns role is installed on the server).If multiple DNS are present add the alternate dns setting as well. My name is Boyan Peychev, and I am the Founder and CEO of ClouDNS. Example nslookup -type=srv _ldap._tcp.DOMAIN.COM. Partner is not responding when their writing is needed in European project application, How to tell which packages are held back due to phased updates, The difference between the phonemes /p/ and /b/ in Japanese. To perform this test, typeNslookup 127.0.0.1 10.12.35.9, where 10.12.35.9 is the IP address of the DNS name server. This might work soon after a DNS TXT record change. Save my name, email, and website in this browser for the next time I comment. I tried the following command with nslookup but it didn't list the TXT records: What is the correct command, or is there a better tool use on Windows 7? For managed services providers, deploying new PCs and performing desktop and laptop migrations are common but perilous tasks. There are other errors that you may encounter less frequently such as No Response from Server, Connection Refused, Network is Unreachable, Server Failure, and Format Error. It allows us to do an IP to name. Your email address will not be published. One is the Domain Name System itself, and the second is the January 3, 2023 DNS is short for the Domain Name System.This is a service that maps IP addresses to domain names. nslookup [exit | finger | help | ls | lserver | root | server | set | view] [options] Parameters. To interrupt interactive commands, press CTRL+C. We will show you how to install the Nslookup command on Ubuntu, Debian, Linux Mint, Kali Linux, CentOS, Fedora, Red Hat, Arch Linux, and Manjaro. Your email address will not be published. You just type Nslookup followed by two arguments: the host name or IP address of the system you want to look up and the host name or IP address of the DNS name server. Maybe the default is to use the ISPs and that DNS is caching old data. Address: 10.12.35.9Name: localhost Youll receive primers on hot tech topics that will help you stay ahead of the game. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? Depending on the query, you can add an extra option as a parameter. ipconfig /all. nslookup <enter> set type=txt <enter> villagevines.com Example C:\Users\wilfried>nslookup Default Server: mydnsserver Address: 192.168.1.1 > set type=txt > villagevines.com Server: mydnsserver Address: 192.168.1.1 *** No text (TXT) records available for villagevines.com > Share Improve this answer Follow edited Oct 15, 2013 at 13:48 Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Now that nslookup is installed, try some of the following commands to get a feel for how it works. The nslookup syntax is as follows: nslookup [options] [domain-name]. This command is the same as the nslookup set querytype command. To force a command to be treated as a host name to be inquired about, precede it with a backslash character. r5r4y. You can define your query for a specific DNS record, to identify the domain, the port in use, and timeout in seconds. If you want high speed, you must use Anycast DNS services! So this line will succeed only if the output of host command contains. Kindly refer to the following related guides: How to setup a cache-only DNS server, how to locate and edit the hosts file on Windows, how to install RSAT tools: DNS manager console missing from RSAT tools on Windows 10, how to setup SPF and TXT Records in AWS, how to add and verify a custom domain name to Azure Active Directory, Active Directory: How to Setup a Domain Controller, how to locate and edit the host file on macOS, and how to know when an IP or domain has been blacklisted. Address: 10.12.35.8. The syntax for non-interactive mode is: nslookup [-option] [hostname] [DNS server name/IP]. ncdu: What's going on with this second size column? However, regularly reviewing and updating such components is an equally important responsibility. The Nslookup syntax is very simple, and you can use it the same on different OSes. nslookup . www.google.com Mainly I want to detect if DNS is configured properly on a machine by using nslookup. What is Nslookup? So I want to write a bash snippet that returns success if the dns entry resolved successfully. <domain-name> is the domain name that you want to query, and <options> is any options that you want to use. Sadly it seems that nslookup still returns success error codes when it fails to lookup an entry. That is security and safety. Based on the distribution you have, use one of the following commands. Here are the 10 most used Nslookupcommands that will help you to understand better your domains management: 2. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. How to find all of the available DNS records of a domain. Get the IP address of a website In its simplest form, without any options, nslookup returns domain name and IP address (both IPv4 and IPv6). You can achieve what you are trying to do, but post-processing the output of the command. It has two modes. In this case, the proxy does DNS for you. (Many programs will automatically retry with a different DNS server if the first one is unreachable, but apparently nslookup does not it'll always be trying the 1st server in the list.). To know more about the usage of the nslookup command, you can refer to this Microsoft page. Trying to understand how to get this basic Fourier Series. For modern operating systems starting with Windows 2000, TCP/IP is installed by default when a network adapter is installed on the computer.. Nslookup.exe can be run in two modes: interactive . View Public Key in Domain Key for a Domain, nslookup cannot resolve hostname for machine on external domain from internal domain, Subdomains on Windows Server - nslookup works, ping only with FQDN, nslookup how to get list of domains in a DNS server, Get DNS 'Additional section' using Windows (nslookup option? host [server] Look up . Thank you. Why are physically impossible and logically impossible concepts considered separate in terms of probability? Paul is a programming enthusiast who loves to write about all things technical. Is there a solution to add special characters from software and how to do it. Usually "ping 123.45.67.89" and tracert or traceroute or nslookup (in windows). The book also compares it to the popular dig command. What if the output is: Take a look at my full command, it pipes the output to grep and grep does return an error code if it does fail to do a match. Find out how to use this command line tool to fix DNS. If you prefer, you can omit the name or IP address of the DNS name server. Now, you are ready to use the Nslookup command on your device and try the examples below. The Nslookup command is a great utility that offers many functionalities. The command above works but villagevines.com has no TXT records however www.villagevines.com does. Asking for help, clarification, or responding to other answers. http://msmvps.com/blogs/acefekay/archive/2010/10/11/edns0-extension-mechanisms-for-dns.aspx Using the Nslookup utility in noninteractive mode will likely be the most familiar way to use this tool, as the entire command is issued at the command line, just like with any of the other TCP/IP utilities. Apart from checking DNS records, you can use the Nslookup to review a particular DNS server and how it works. It is working fine. As I mentioned, using the Nslookup utility in interactive mode provides you with a whole host of additional subcommands. nslookup (name server lookup) is a network administration command-line tool for querying the Domain Name System (DNS) to obtain the mapping between the domain name and the IP address, or other DNS records. Command line: To see basic information about a domain's A record, simply specify the domain name as an argument. After deleting the outdated reverse lookup zone, please restart your DNS server. Thank You. nslookup allows itself to be used in the command-line of the operating system in question; Windows users start the In an effort to narrow down the issue try the following: - open command prompt. Nslookup Verbose Already working on this. What can the nslookup command do? For modern operating systems starting with Windows 2000, TCP/IP is installed by default when a network adapter is installed on the computer. Select Path in the System variables pane at the bottom of the new window.. More information on the Nslookup utilityIf you want to learn more about the Nslookup utility, you should investigate the OReilly and Associates bookDNS and BIND by Paul Albitz and Cricket Liu. Unrecognized commands are interpreted as host names. After you install Active Directory on a server that's running the DNS service, you can use the DNS Management Console to verify that the appropriate zones and resource records are created for each DNS zone. It only takes a minute to sign up. For example, if you want to check the NS DNS of google, the command should be nslookup -type=ns google.com. The correct solution would be to use dig and test if there is any text with the short option: Agree the fact, nslookup, returns 0 for both successful and failing DNS look-ups. Why zero amount transaction outputs are kept in Bitcoin Core chainstate database? Any unrecognized command is interpreted as a host name. This record should appear similar to the following one: Nslookup is a command-line tool that displays information you can use to diagnose Domain Name System (DNS) infrastructure. @Magoo I tried your corrections, now I'm getting the following output when I run the batch file: ` (FOR /F "skip=3 delims=: tokens=2" %j in ('nslookup HOSTNAME_EDITED') do @echo HOSTNAME_EDITED %j 1>>Results\Results.txt ) The syntax of the command is incorrect. . How Intuit democratizes AI development across teams through reusability. nslookup is a simple but very practical command-line tool, which is principally used to find the IP address that corresponds to a host, or the domain name that corresponds to an IP address (a process called "Reverse DNS Lookup"). Either type the domain name you want the nslookup details for or quit nslookup with the exit command (or the Ctrl+C keyboard shortcut). Commands not recognized. SLAs involve identifying standards for availability and uptime, problem response/resolution times, service quality, performance metrics and other operational concepts. Public VS Private IP Address: What Are the Differences? To learn more, see our tips on writing great answers. This is vital for IP address to domain name resolution. The -debug option instructs nslookup to display detailed results, including the TTL. You have IPv6 addresses of (CloudFlare's) DNS servers configured but you don't actually have an IPv6 address of your own your Internet access is IPv4-only. NSLOOKUP is not being recognized as a command Fox Feb 27, 2004 F Fox Feb 27, 2004 #1 Sorry if this appears as a duplicate, I believe this was sent to the wrong group previously. As you can see below, the DNS records are populated with the wrong IP parameters of my old network. But worry either I have made any mistake in DNS configuration. Mine works too but I have to confess that yours is better shorter and easier to read. The Nslookup command is amazing and stands out among the DNS probing commands! 1. To use the nslookup command, you need to open Command Prompt and ensure that your PC is connected to the internet. Nslookup.exe is a command-line administrative tool for testing and troubleshooting DNS servers and host name resolution issues. If you are interested in similar tools, you can see Ping,Traceroute, Dig, and Hosttoo. This is closer, I think but still doesn't seem to be working. We bring you news on industry-leading companies, products, and people, as well as highlighted articles, downloads, and top resources. http://technet.microsoft.com/en-us/library/ff807362(v=ws.10).aspx, --Check NIC binding the NIC which is online and has ip details should be in first order.If multiple NIC are present then disabled the unrequired NIC. Netlogon.dns is located in the %systemroot%\System32\Config folder. The last parameter is the DNS to use. You will need to have administrative privileges or be a sudo user. Making statements based on opinion; back them up with references or personal experience. It would be really helpful if MS would put it in Windows, though, can we know how many live ip address are using our local network by using nslookup commands? ConclusionSo, does it help to know about the Nslookup program, even though Windows NT/2000 currently contain their own such utilities in the form of a DNS Manager or Console? The nslookup command-line tool has two modes: interactive and noninteractive. Would love your thoughts, please comment. You can put up a dnsLookup.sh script with something like. What is the correct way to screw wall and ceiling drywalls? nslookup -type=srv _vlmcs._tcp.<FQDN> it shows the name of my KMS and NOT the one that is in slmgr /dlv. If computerTofind is an IP address and the query is for an A or PTR resource record type, the computer's name will be returned.If computerTofind is the name and there is no space, the default DNS domain name will be added to the name.This action will depend on the status of the following subset commands: domain, srchlist, defname andsearch. If you just type nslookup and press Enter, the displayed information will be your local DNS server and its IP address. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? The nslookup utility lets you query Internet domain name servers. An unrecognized command is interpreted as a computer name. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Download BIND for Windows, there is a Windows port of dig in that. I have no problem accessing the google servers and working with the internet so obviously DNS works. We will start with a simple and general example. Here Are Some Information About IPv4 VS IPv6 Addresses. By checking the NS records, you can see which is the authoritative server for a specific domain. This will apply the new changes. You bet it does. For example, using the Set subcommand with the keyword Debug and then testing TechRepublic.com yielded the results shown in Figure B. In this particular example I've set up my DNS to use Cloudflare DNS but the same problem occurs if I . Required fields are marked *. It can be helpful for protecting against different phishing attacks, which involve falsifying a domain name. To treat a built-in command as a host name, precede it with an escape character, which is a \. I'm currently having problems accessing one of my clients servers and it seems that there is probably a problem with the network connection between myself and the server. Now, you have just the new zone you have created left and this is the desired result we want. Here we are checking the MX records of the mail servers. In addition, it is extremely easy to use, and it is available on every operating system (OS). Provide us However, there are a few rules that we need to cover first. It is used for querying the DNS and obtaining domain names, IP addresses, and DNS resource record information. Asking for help, clarification, or responding to other answers. 4:33 pm Instead, it travels over IP-based networks. Required fields are marked *. It is possible when you try to use the Nslookup command that you get an error saying that the command is not found. As you can see, there are several basic subcommands and a subset of additional keywords associated with the Set subcommand. Overall, using the nslookup command to troubleshoot DNS Server and host name resolution issues is generally very helpful as you are removing some of the higher-level protocols which can interfere in the troubleshooting process. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If still issue persist post the ipconfig /all and dcdiag /q output of DC.Please use skydrive to post the logs. With a lot of choices in the market, we have highlighted the top six HR and payroll software options for 2023. Command line: Use this command to find the address record for a domain. In the Open box, type cmd. - Go to the Reverse Zone Lookup folder icon, - Right-click on it and - Select New Zone A new zone has been created. The first record in the file is the domain controller's Lightweight Directory Access Protocol (LDAP) SRV record. However this does not seem to work on my computer. Why do many companies reject expired SSL certificates as bugs in bug bounties? How to react to a students panic attack in an oral exam? Author Linda has been working as an editor at MiniTool for 1 year. It allows us to do a name to IP address. To query the DNS server for the MX records for the domain, google.com, type google.com after the type has been set to MX. --Ran ipconfig /flushdns and ipconfig /registerdns.Restart the netlogon and DNS service. Please follow the steps from the previous part on How to install Nslookup command. Applies to: Windows Server 2022, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, Windows Server 2012. The nslookup command can be used in two modes: interactive and non-interactive. More info about Internet Explorer and Microsoft Edge, Specifies a DNS resource record type. Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Share Improve this answer Follow For example, you can download Nslookup2000 free from the authors site. http://blogs.technet.com/b/hishamb_msft/archive/2010/09/02/dns-forwarders-problems-in-windows-2008-r2-dns-services.aspx You will learn more about the options throughout this tutorial. 5. Does anybody have any idea why nslookup does not work? Tag Description-ansi: In C mode, support all ISO C90 programs. The Nslookup command is a very popular and powerful tool. HTH next time when you need to query your TXT records. However one of the things I've tried is to get the actual IP address of the server via the nslookup windows command line tool. Applies to: Windows Server 2012 R2 Identify those arcade games from a 1983 Brazilian music video. 6. You should use dig instead of nslookup. Recommended Articles. What is nslookup? If you are running Windows 2000, you typically head to the DNS Console, since it is the primary tool for administering Windows 2000 DNS name servers. Article for DIG is coming soon! traceroute, ping, nslookup, etc. Nslookup Command Syntax Click on ok when complete. If yes, Please guide. To start Nslookup.exe in interactive mode, simply type nslookup at the command prompt: Typing help or ? To use Nslookup to verify the SRV records, follow these steps: Nslookup returns one or more SRV service location records that appear in the following format, where is the host name of a domain controller, and where is the domain where the domain controller belongs to, and is the domain controller's Internet Protocol (IP) address: For more information about the SRV records that are registered by Netlogon, see SRV Records Registered by NetLogon. In case you do not have it already, you can install it in several easy steps. This is the sole reason why you are advised to configure a static address for your DNS server that will never change, or else you risk having DNS resolution errors. This article describes how to verify Service Location (SRV) locator resource records for a domain controller after you install the Active Directory directory service. The two most common errors that you may encounter using the nslookup command are Timed-Out and Non-existent Domain. TechRepublic Premium editorial calendar: IT policies, checklists, toolkits and research for download, The best human resources payroll software of 2023, Windows 11 update brings Bing Chat into the taskbar, Tech jobs: No rush back to the office for software developers as salaries reach $180,000, The 10 best agile project management software for 2023, 1Password is looking to a password-free future. You can use this command to see how many A records are there and see the IP Addresses of each one. Thanks! SLAs streamline operations and allow both parties to identify a proper framework for ensuring business efficiency My first computer was a Kaypro 16 \"luggable\" running MS-DOS 2.11 which I obtained while studying computer science in 1986. Works now. Should I put my dog down to help the homeless? Stay up to date on the latest in technology with Daily Tech Insider. You can increase it to give more time for the server to respond. The following commands can be interrupted at any time by entering a Ctrl-C key sequence. In C++ mode, remove GNU extensions that conflict with ISO C++.. How to query the SOA record of a domain. The adage youre only as good as your last performance certainly applies. There are Nslookup online tools too. Many times you check the A records to see the IPs of a domain, but sometimes you need to verify if an IP address is related to a specific domain. All rights reserved. I have no ideea why but if you add an IP of a nameser at the end it will work. These are the uncached A, AAAA, CNAME, TXT, NS, MX and SOA records for facebook.com. - make sure you are on the C:\> directory. 4. Before I move on, there is one little tip that I want to share with you. It's used to identify computers hosting specific services. nslookup unrecognized commandthe invisible life of addie larue sequel. Alternatively, the non-interactive mode is useful when only a single piece of data needs to be returned. Commands exit It only takes a minute to sign up. N.B. Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? At this prompt, you can type the host name or IP address of the system you want to look up. We are able to get information like DNS servers IP address, MX records information, NS server details, etc. If you want to test other DNS name servers on your network, you can do so easily from within the interactive mode. For Don: running slmgr /dlv all shows just one licensed server and it displays the same result as slmgr /dlv with KMS machine name from DNSs: "not the name that is in nslookup -type=srv _vlmcs._tcp.<FQDN>" http://msmvps.com/blogs/acefekay/archive/2010/10/11/edns0-extension-mechanisms-for-dns.aspx, http://blogs.technet.com/b/hishamb_msft/archive/2010/09/02/dns-forwarders-problems-in-windows-2008-r2-dns-services.aspx, http://technet.microsoft.com/en-us/library/ff807362(v=ws.10).aspx, http://theregime.wordpress.com/2008/03/04/how-to-setview-the-nic-bind-order-in-windows/. Step 2: Type command to run Type in appropriate syntax at the command prompt to run Nslookup.exe. In interactive mode, you can query name servers for information about various hosts and domains or print a list of hosts in a domain. $ nslookup -timeout=20 example.com. You can use a text editor, such as Notepad, to view this file. $ nslookup -debug example.com. 1) Open Command Window (Go to Start--> Run, type in cmd) 2) Type in NSLOOKUP internetsite.com (i.e., NSLOOKUP whatis.com) OR Type in NSLOOKUP IP Address (i.e., NSLOOKUP 216.34.126.200) 3) The host name or IP address of the domain should appear How is this relevant to Load Testing? My Computer. If the service was stopped, you would need to restart your Linux computer, and it will be running again. --If the public ip address is added in the NIC DNS setting remove the same and add to DNS forwarders if required. Command line: To subscribe to this RSS feed, copy and paste this URL into your RSS reader. $nslookup -type=soa example.com, 30-day Free Trial for Premium Anycast DNS hosting. Get IT Done: Troubleshooting DNS problems with Nslookup. When he's not writing articles for ITGeared.com, Paul likes to spend his time tinkering with computers and playing video games. Computer OSs like Windows, macOS, and most Linux distributions have it as a built-in tool. Hi, can I find the subnet mask of an IP with NSLookup ? The domain name is a concept of the World Wide Web. If you are running Windows NT, chances are you head to the DNS Manager, since it is the primary tool for managing Windows NT DNS name servers. Next, we look at the authoritative (SOA) information about the domain. The former indicates other DNS name servers along the path that include TechRepublic.com in their database, while the latter simply lists the IP addresses associated with the host names of the DNS name servers. At the same time, the set option has many parameters like all | class | d2 | debug | domain | port | querytype | recurse | retry | root | search | srchlist | timeout | type | vc. The nslookup command or tool is an administrative tool for debugging or troubleshooting the DNS server issues. Second, if you initiate one of the interactive subcommands and decide you want to cancel the operation before it continues, you can press [Ctrl]C. Third, the Nslookup utility will interpret any unrecognized interactive subcommand as a computer name, which could cause an error message. We have to manually enter the right IPs' to have this issue corrected. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Address: 127.0.0.1, Switching DNS name serversBy default, the Nslookup utility directs its queries to the default DNS name server. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Attackers use a misspelled domain name or trick users by adding or omitting a hyphen. You could instead use nslookup by typing the command before the domain, all on the same line: nslookup lifewire.com. nslookup finger: Connects with the finger server on the current computer. The second reason is not so obvious, but it should not be neglected. You could try disabling ipV6 and see if you then connect by V4 or try this - nslookup -query=AAAA google.com See explanation AAAA Records https://support.dnsimple.com/articles/aaaa-record/ Technician / Consultant Was this reply helpful? I believe that nslookup does not return 0 in all cases anymore, for me now if it fails, it returns 1.