A website hosted on the I2P anonymity network, analogous to an .onion site on Tor. Eepsites use .i2p addresses and are accessible only through an I2P router, making them invisible to clearnet DNS and ISP surveillance.
Eepsites work like hidden services: the site operator never reveals their IP, and visitors' traffic is routed through multiple I2P nodes before reaching the server. The name comes from I2P's Invisible Internet Project. Unlike Tor, I2P was designed for internal network communication first, external anonymity second—which gives it different threat models and performance characteristics.
Common uses include privacy-conscious forums, file-sharing communities, and sites operating in jurisdictions with strict censorship. The barrier to entry is higher than Tor (I2P requires software setup), so eepsites attract fewer casual visitors and script-kiddies. They're also less vulnerable to exit-node snooping because there's no clearnet exit layer.
For domain operators: eepsites don't need traditional registrars or DNS. You generate a keypair, derive your .i2p address, and publish it. No expiration, no renewal, no KYC. The trade-off is discoverability and trust—address derivation is deterministic but cryptographically unforgeable.