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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Key Applications and Application Protocols
           9  TCP/IP Administration and Troubleshooting Utilities and Protocols

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TCP/IP DNS Name Resolution and Information Lookup Utilities (nslookup, host and dig)
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12
3
Next Page
TCP/IP Network Status Utility (netstat)
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TCP/IP DNS Registry Database Lookup Utility (whois/nicname)
(Page 3 of 3)

Third-Party whois Tools

Many operating systems, including Windows, do not come with a whois command implementation, but there are third-party programs that will support the function. In recent years many different organizations have also set up Web sites that implement the whois function, which is much more convenient and user-friendly to those more accustomed to graphical operating systems like Windows. Many of these sites are provided as free services by DNS registrars, so customers can check if a name they are interested in is already taken, and if so, by whom.

One drawback of some of these systems is that they usually do not have the intelligence to check all the different registries where domain name records are stored. In most cases, a whois service provided by a registrar will only search for names in the particular top-level domains (TLDs) in which the registrar operates. So, if the registrar deals with .COM, .ORG and .NET, it may only support whois queries for those TLDs. To check the registration information for domains in more obscure TLDs, such as some of the less common geopolitical (country code) domains, a considerable amount of searching may be required.

Key Concept: The TCP/IP whois utility allows registration information to be displayed for a DNS domain, such as its owner, contact information and the date that its registration expires. The program is most commonly found on UNIX operating systems, where it is given intelligence that allows it to automatically query the correct servers to find the information for most domains. Newer Web-based whois utilities also now exist, but are usually limited to displaying information about domains in only a specific subset of top-level domains.



Previous Topic/Section
TCP/IP DNS Name Resolution and Information Lookup Utilities (nslookup, host and dig)
Previous Page
Pages in Current Topic/Section
12
3
Next Page
TCP/IP Network Status Utility (netstat)
Next Topic/Section

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Version 3.0 - Version Date: September 20, 2005

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