Set a deny rule for a URL in IPFW by its domain name

[Kulamani Sethi]

Hi all,
   I am using ipfw3, can i block a URL by its domain name? When i am
setting rules in IPFW by its domain name, it simple set rule by its
corresponding IP.
Here example how i set

C:>ipfw add 1002 deny log ip  from www.google.com to any

As i know most of the websites uses dynamic IP, it simple changes there IP
periodically. This rule i set for google is worked for few moment, then it
allow the packets to my terminal.