PeerBlock for Windows

Open-source IP blocking firewall tool

PeerBlock is a free and open-source personal firewall developed by a small team led by Mark Bulas. It blocks incoming and outgoing network traffic based on blacklists of IP addresses, allowing users to prevent connections with specified hosts. PeerBlock relies on publicly available blocklists, primarily sourced from I-Blocklist, as well as user-defined lists.

PeerBlock enables users to block IP ranges using maintained or custom blocklists. Users can select which lists to enable and configure how traffic is filtered. The software includes list management features, allowing users to organize categories and control how blocking rules are applied.

IP blocking and network monitoring

The application also provides a real-time log of network activity, displaying details such as time, source, destination, IP address, and protocol for each connection. This gives users visibility into both blocked and allowed traffic for basic monitoring and troubleshooting.

Platform support, use cases, and limitations

PeerBlock is primarily designed for Windows and does not have official versions for macOS or Linux. As a personal firewall focused on IP-based filtering, PeerBlock is best suited for users who want control over network connections at the IP level. However, it is not a comprehensive security solution as it does not scan for malware, replace traditional firewalls, or provide anonymity.

Focused tool for IP traffic filtering

PeerBlock gives users a hands-on way to manage their network by controlling which IP addresses can connect to their system. With flexible blocklists and a clear, real-time view of activity, it offers a practical and easy-to-use solution for everyday network awareness.