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Editors’ Review

Download.com staff

PeerBlock is a free and open-source personal firewall designed to block incoming and outgoing connections based on customizable blacklists of IP addresses and networks. It allows users to select from predefined lists, such as advertising, spyware, educational institutions, or P2P trackers, or add custom entries to restrict which IP addresses can connect to or from their computer.

PeerBlock provides a straightforward interface for managing blocklists, viewing connection activity, and controlling which lists are active. Its main strength lies in giving users detailed control over network connections and filtering unwanted peers or entities during P2P activity, browsing, and general internet use.

Privacy-focused connection filtering tool

PeerBlock supports multiple blocklist categories and lets users decide which lists to enable, making it flexible for specific needs such as filtering P2P peers or blocking ad and spyware hosts. The interface clearly presents active lists and connection logs while allowing manual adjustments or whitelisting if legitimate connections are mistakenly blocked. Its lightweight design ensures minimal system impact during operation.

In practice, the program is especially useful for adding an extra layer of filtering beyond standard firewall protection. It provides real-time visibility into what connections are blocked and allows users to customize filtering behavior. However, it functions best as a companion tool; many users combine it with a VPN or a more complete security suite to achieve better overall protection and privacy.

One significant drawback is that the tool’s overall effectiveness relies heavily on the quality and frequency of its blocklist updates. Since IP addresses change frequently and some hosts use advanced evasion techniques, full protection cannot be ensured. Manual updates may also be required, reducing reliability. These limitations make it best used alongside other security and privacy tools for consistent results.

Enlarged image for PeerBlock
PeerBlock 0/1
  • Pros

    • Free and open-source software
    • Customizable blocklists for connection filtering
    • Lightweight and easy to use
  • Cons

    • Depends on blocklist accuracy and update frequency
    • Does not encrypt or anonymize traffic
    • May block legitimate connections unintentionally

Bottom Line

Practical choice with caveats

PeerBlock remains a useful and lightweight tool for users seeking greater control over network activity and connection privacy. It works best as a supplementary safeguard, giving insight into connections while adding customizable blocking options. Although it does not encrypt data or guarantee full anonymity, it contributes effectively to safer browsing and more transparent network management when paired with other reliable privacy tools.

What’s new in version 1.2.r693

  • Enhanced blocklist management and update tools
  • Added improved log viewer for monitoring activity
  • Optimized performance on modern Windows systems
  • Increased stability during long sessions


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Full Specifications

GENERAL
Release
Latest update
Version
1.2.r693
OPERATING SYSTEMS
Platform
Windows
Operating System
  • Windows 8
  • Windows XP
  • Windows Vista
  • Windows 7
  • Windows 2000
POPULARITY
Total Downloads
710,336
Downloads Last Week
7

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Last Updated


User Reviews

3.8/5

32 User Votes


Developer’s Description

Block all communications with selected IP and IP ranges with ease.
PeerBlock lets you control who your computer "talks to" on the Internet. By selecting appropriate lists of "known bad" computers, you can block communication with advertising or spyware oriented servers, computers monitoring your p2p activities, computers which have been "hacked", even entire countries. They can't get in to your computer, and your computer won't try to send them anything either.

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