The simplest way is to use the “host” utility provided by Gnu/Linux. Just run…
poison:~ # host 64.233.187.99
99.187.233.64.in-addr.arpa domain name pointer jc-in-f99.google.com.
poison:~ #
This will query the name server and provide you with the hostname of the IP address.By default it will query the nameserver listed in the /etc/resolv.conf file.
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source:http://linuxpoison.blogspot.com/2008/04/135781758019216.html