Nslookup
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The nslookup command can be used in Windows and Unix to find the IP addresses of a particular computer, using DNS lookup. The name means "name server lookup".
$ nslookup www.wikipedia.org Server: ns0.southern.edu Address: 216.229.224.4
Non-authoritative answer: Name: www.wikipedia.org Addresses: 207.142.131.248, 207.142.131.235, 207.142.131.236, 207.142.131.245 207.142.131.246, 207.142.131.247