I2P

I2P
I2P
Original author	I2P Team
Release	2003
Stable release	2.13.0 / 24 July 2026
Written in	Java
Operating system	Cross-platform: Unix-like (Android, Linux, BSD, macOS), Microsoft Windows
Available in	62 languages Albanian; Arabic; Armenian; Asturian; Azerbaijani; Bengali; Bosnian; Breton; Bulgarian; Catalan; Chinese (China, Gan, Taiwan); Croatian; Czech; Danish; Dutch; Estonian (Estonia); Filipino; Finnish; French; Galician; German; Greek; Hebrew; Hindi; Hungarian; Icelandic; Indonesian; Italian; Japanese; Korean; Kurdish; Lithuanian; Macedonian; Malagasy; Mongolian; Norwegian (Bokmål, Nynorsk); Occitan (post 1500); Oromo; Persian; Polish; Portuguese (Europe, Brazil); Romanian; Russian (Russia); Serbian; Sinhala; Slovak; Slovenian; Spanish (Europe, Argentina); Swedish (Sweden); Tagalog; Thai; Turkish (Turkey); Turkmen; Ukrainian (Ukraine); Urdu; Vietnamese; Yoruba; ; ;
Type	Anonymity application, Overlay network, mix network, garlic router, peer-to-peer
License	Public domain, BSD, GPL, MIT (license varies by component)
Website	i2p.net
Repository	github.com/i2p/i2p.i2p ;

The Invisible Internet Project (I2P) is an anonymous network layer (implemented as a mix network) that allows for censorship-resistant, peer-to-peer communication. Anonymous connections are achieved by encrypting the user's traffic (by using end-to-end encryption), and sending it through a volunteer-run network of roughly 55,000 computers distributed around the world. Given the high number of possible paths the traffic can transit, a third party watching a full connection is unlikely. The software that implements this layer is called an "I2P router", and a computer running I2P is called an "I2P node". I2P is free and open source, and is published under multiple licenses.