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; this is installed in the Utilities folder within the Applications folder. 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. Launch the Network Utility.
   
   
2. In the Network Utility window, click the Lookup tab.
   
   
3. In the field under "Please 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. In the pop-up menu next to "Select the information to lookup:", select Default Information.
   
   
5. In versions of Mac OS X prior to 10.4.x, uncheck Use "dig" in place of "nslookup".
   
   
6. Click Lookup.

Also see:

• In Unix, how do I look up IP addresses?
• In Unix, how can I find out the domain name associated with an IP number?