Using domain server:
Name: 8.8.8.8
Address: 8.8.8.8#53
Aliases: 

google.com has address 74.125.113.147

##</code><code>##

$ host google.com 8.8.8.8

google.com          	A	74.125.113.99

##</code><code>##

/A (\S+)/ and do_something($1);