This page provides the specifications for various components of the I2P network and router software. These are living documents, and the specifications are updated as modifications are made to the network and software. The proposal documents that track changes to these specifications can be viewed here.
- "Last updated" is the last date when the specification given within a document was altered in any way, except for changes to the "accurate for" information.
- The "accurate for" column gives the version of the I2P network and reference Java implementation that the document is verified to be valid for. Because the documents are usually only updated when changes are made, the listed versions can sometimes be several releases behind. This does not mean that documents with old listed versions are necessarily inaccurate, but small differences may creep in during the course of development. Periodic reviews are conducted to update the "accurate for" information.
The I2P Project is committed to maintaining accurate, current documentation. If you find any inaccuracies in the documents linked below, please enter a ticket identifying the problem.
|Title||Category||Last updated||Accurate for||Link|
|Common structures Specification||Design||0.9.49||HTML | TXT|
|Low-level Cryptography Specification||Design||0.9.47||HTML | TXT|
|Tunnel Creation Specification||Design||0.9.41||HTML | TXT|
|Tunnel Message Specification||Design||0.9.49||HTML | TXT|
|NTCP 2||Transports||0.9.50||HTML | TXT|
|SSU Protocol Specification||Transports||0.9.48||HTML | TXT|
|Datagram Specification||Protocols||0.9.39||HTML | TXT|
|ECIES-X25519-AEAD-Ratchet||Protocols||0.9.47||HTML | TXT|
|Encrypted LeaseSet Specification||Protocols||0.9.41||HTML | TXT|
|I2CP Specification||Protocols||0.9.48||HTML | TXT|
|I2NP Specification||Protocols||0.9.49||HTML | TXT|
|Streaming Library Specification||Protocols||0.9.46||HTML | TXT|
|Access Filter Format Specification||0.9.40||HTML | TXT|
|Addressbook Subscription Feed Commands||0.9.49||HTML | TXT|
|B32 for Encrypted Leasesets||0.9.47||HTML | TXT|
|Blockfile and Hosts Database Specification||0.9.47||HTML | TXT|
|Configuration File Specification||0.9.45||HTML | TXT|
|ECIES-X25519 Router Messages||None||HTML | TXT|
|ECIES-X25519 Tunnel Creation||None||HTML | TXT|
|GeoIP File Specification||0.9.9||HTML | TXT|
|Plugin Specification||0.9.43||HTML | TXT|
|Red25519 Signature Scheme||0.9.47||HTML | TXT|
|Software Update Specification||0.9.42||HTML | TXT|