Blocking access to site based on domain name

Anyone know a way to block access to a site based on their domain name?

Say I want to block access to all sites on my server if you are coming from any .com

I know you can block based on ip address but any .com would be impossible to find all the ips that might be used.

I would like to do this at the server level vice database level if possible.

Thanks

Subject: Blocking access to site based on domain name

Do you have a firewall?

ST

Subject: RE: Blocking access to site based on domain name

Yes, but most firewall mfg’s are moving away from this type of thing.

It is being moved to the application layer now.

Both IIS and Apache provide this functionality, so I assumed Domino would as well.

dalessit