The host command accepts arguments that are either the fully qualified domain name or the IP address of the server when providing results. To perform a forward lookup, use the syntax:
[root@bigboy tmp]# host www.linuxhomenetworking.com
www.linuxhomenetworking.com has address 65.115.71.34
[root@bigboy tmp]#
To perform a reverse lookup
[root@bigboy tmp]# host 65.115.71.34
34.71.115.65.in-addr.arpa domain name pointer 65-115-71-34.myisp.net.
[root@bigboy tmp]#
As you can see, the forward and reverse entries don't match. The reverse entry matches the entry of the ISP.
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