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Looking Up Hostnames on Linux

A few ways of looking up hostnames on Linux:

$ host yahoo.com

yahoo.com has address 98.139.183.24
yahoo.com has address 206.190.36.45
yahoo.com has address 98.138.253.109
yahoo.com has IPv6 address 2001:4998:44:204::a7
yahoo.com has IPv6 address 2001:4998:c:a06::2:4008
yahoo.com has IPv6 address 2001:4998:58:c02::a9
yahoo.com mail is handled by 1 mta6.am0.yahoodns.net.
yahoo.com mail is handled by 1 mta5.am0.yahoodns.net.
yahoo.com mail is handled by 1 mta7.am0.yahoodns.net.

$ getent hosts yahoo.com

2001:4998:58:c02::a9 yahoo.com
2001:4998:44:204::a7 yahoo.com
2001:4998:c:a06::2:4008 yahoo.com

$ nslookup yahoo.com

Server:		127.0.1.1
Address:	127.0.1.1#53

Non-authoritative answer:
Name:	yahoo.com
Address: 98.138.253.109
Name:	yahoo.com
Address: 98.139.183.24
Name:	yahoo.com
Address: 206.190.36.45

Apparently, getent is the way to go, because it respects your /etc/hosts file, but the above also reminds us that we could use gethosstip from the syslinux package.

See also this good explanation at serverfault.