Find out the domain name associated with an IP number in Unix

To find the domain name associated with an IP number, use the nslookup command. At the Unix shell prompt, enter nslookup followed by the IP address, for example:

  nslookup 129.79.5.100

This command will return the following information:

  Server:  ns.indiana.edu
  Address:  129.79.1.1

  Name:    ns2.indiana.edu
  Address:  129.79.5.100

You can also specify a hostname on the command line to find out its IP number.

You can use the nslookup command interactively. For more information, at the Unix shell prompt, enter:

  man nslookup