Squid Blacklists - Web Filter - Blacklist - Squid Filter

Our USG blacklist is directed at blocking unwanted communications with United States government networks, intelligence agencies, and military networks. However, You could still visit useful sites such as the social securtiy administration, the us postal service, or your local unemployment office website. This list is not intended to block non threatening, government service type websites that we all use. But it is designed to block the US Government networks that you likely, really do not want traffic from your network reaching. It is a simple CIDR formatted list, so you could use it for your firewall rules just as easily as you can for a squid acl.

via squidblacklist.org