IP Blocker Firewall - Version 5.1 IP Blocker Firewall is Windows IP Blocking software which controls one computer interacting with other computers over the network. It can be successfully used on Windows server machines, in a production environment, to easily ban unwanted IP addresses or visitors by country with Apache's .htaccess files. IP Blocker Firewall is a lightweight firewall and the rules are based on IP address, port, protocol, and other TCP/IP factors.