nslookup - it's your friend

unsure of a hostname or ip address - how can I find out the domain name associated with an IP number?

use nslookup


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