Block and manage IP blacklists easily with PeerGuardian for Mac OS X

Apr 16, 2010 - 8 Comments

peer guardian logo PeerGuardian is a free open source tool that allows you to easily block large numbers of IP addresses in Mac OS X. It automatically maintains an internal IP blacklist to block IP’s deemed unsafe or dubious in nature, and also allows for multiple IP lists with the ability to block entire protocols. Other features include logging and maintenance tools to see what exactly is being blocked. Many people use PeerGuardian in conjunction with an extensive external IP blacklist when using P2P file sharing applications and networks to better maintain their security and privacy.

Many Mac users are surprised to note that is a blocked IP in the PeerGuardian IP list, but HTTP and FTP traffic from will flow through fine (ie: websites, Software Update, Apple web services, iCal, etc). This can lead to some problems with other Apple accessed servers though, like .Mac mail, some iChat traffic, and the Network Time Protocol. Of course you can manually edit the IP block list and remove Apple entirely if this is too restrictive for your needs.

If you’re a heavy P2P user, you’d likely benefit from downloading and installing PeerGuardian.

PeerGuardian developer home
Download PeerGuardian for Mac OS X now

peer guardian mac os x ip block
PeerGuardian is also available as a free download for Windows and Linux if you’d like to install it on other platforms.


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Posted by: David Mendez in Mac OS, Security


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  1. Andrea says:

    0 0 0 Is all I get after last mountain lion update. Any tip on how to re-activate PeerGuardian?

  2. Matt says:

    I have peer guardian for my mac but it often fills the screen with block reports – how do I keep it but stop it displaying every single block?

  3. Jonypdx says: seems to be available through GoDaddy. Can’t find any current info on iys demise. Any thoughts anyone?

  4. EagleEye says:

    What is the method to determine additional IPs deemed needing to be blcked?

    Littlesnitch blocks unseen communications between unregistered software and registration server so both apps moniter background communications
    But littlesnitch won’t stop someone from taking your password keystrokes or bank card info. Blocking the IPs of those hackers will.

  5. anonymous says:

    Tracy – wrong. There are many reasons to block massive amounts of IP addresses, like for instance privacy, security, I feel like it… I don’t need ppl “up in muh bit-ness”

    Bruce – clearly you don’t understand what this software does.

  6. Bruce says:

    Little Snitch for Mac

  7. Tracy says:

    there is no purpose to use this software except for torrents and p2p

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