In Mac OS X, how do I find the IP address or domain name of another networked device?

In Mac OS X, to find the IP address or domain name of another networked device, use the Network Utility. With it, you may query a DNS server for information on specific computers. The Network Utility is able to make detailed queries about hosts, but to make a simple one:

1. From the Go menu in the Finder, select Utilities. From inside the Utilities folder, launch Network Utility.
   
   
2. In the Network Utility window, click the Lookup tab.
   
   
3. In the field under "Enter an internet address to lookup.", enter the IP address or domain name of the computer you are looking up.

   Note: To find a computer or device's domain name, you must already know its IP address; conversely, to find the IP address, you must already know the domain name.

4. Click Lookup.

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