The Howdy Glossary

PeerBlock is a personal firewall software enabling users to manage which IP addresses can interact with their computers, enhancing privacy by blocking organizations from monitoring internet activity and preventing malicious software from connecting. It operates using lists of known undesirable IP addresses, such as anti-piracy groups, government agencies, and malware distributors. Running in the background, it updates its blocklists in real-time through P2P blocklist management sites.

Initially developed by Mark Bulas and his team, PeerBlock builds on the foundation of PeerGuardian 2 software created by Tim Leonard. PeerGuardian was designed as an open-source firewall application to block specific IP addresses' connections. Enhancing this work, Bulas's team focused on improving functionality and ensuring robust privacy protection through real-time blocklist updates sourced from P2P management websites.

PeerBlock distinguishes itself through its specialized focus on blocking connections from undesirable entities like anti-piracy groups and government agencies. This targeted approach provides users with tailored protection against specific privacy threats while maintaining compatibility with file-sharing applications. Despite competition from other firewalls like GlassWire or VPN services offering broader security features, PeerBlock’s ability to provide real-time updates for evolving threats gives it an edge in safeguarding individual online activities against unwanted surveillance and cyber threats.