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4 Notices
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Windows > How to do a NSLookup & Understanding DNS - Web Africa > Support KnowledgeBase
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How to do a NSLookup & Understanding DNS
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Introduction All resellers should have a solid understanding of DNS and be well versed in performing NSLookup`s. Overview DNS - or "Domain Name System" is a vital component of the internet, it is a heirachially based routing system that translates friendly easy to remember address"s (hostnames) such as www.example.com into numbers (ip address`s). For further reading please see Wikipedias DNS article. Performing an NSLookup An NSLookup involves a nameserver being queried with a domain. There are many ways to perform an NSLookup to check the value of records for a dns zone or domain: 1.) Web There are numerous websites able to perform NSLookups, we will use Kloth.net`s NSLookup facility for this article. Lets query webafrica.co.za and see what records are setup at our local nameservers: - Proceed to http://www.kloth.net/services/nslookup.php - Enter in the domain "webafrica.co.za", leave the nameserver as "localhost", and set the query type set to "ANY". Then submit the form. In the results, you should see something along the lines of: DNS server handling your query: localhost DNS server"s address: 127.0.0.1#53 Non-authoritative answer: Name: www.webafrica.co.za Address: 196.31.65.20 Congratulations! You have successfully performed an NSLookup :) 2.) Application/Software A favorite network utility at Web Africa is called Cyberkit (3.0 beta), mostly for its robustness, clean interface, ease of use and mutli functionality. It is able to perform Ping, Traceroute, Whois, NSLookup, Portscan, MailChecker, and more. It can be downloaded here or try googling for it. After you have installed and launched the application hit ctrl+6 to switch to NSLookup mode. Simply enter a domain (such as "webafrica.co.za") and your ISP"s nameserver. For example, a list of SAIX"s nameservers can be found here. In our example, we"ve used ns1.wadns.net*, make sure the record type is set to "ALL" and you should see something along the lines of:  * Any correctly-set-up hosting nameserver will return either erroneous or incomplete records for domains for which it is not officially authoritative. The next section deals with finding the authoritative nameservers from which to get official DNS results.
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