how to block .........@domain.com hosts?

Dear all,

I would like to ask how can I block a range of domain hosts?
For example:
host1.microsoft.com [ 222.222.222.1 ]
host2.microsoft.com [ 111.111.111.2 ]
host3.microsoft.com [ 100.100.100.100 ]
www.microsoft.com [ 123.123.123.123 ]

I want to block all xxxx.microsoft.com (but, I don't know the IP
address) under ipfilter. What can i do?

pls help!

(hope you understand my question. Thanks!)