Core.onion is a hidden service website of the Tor network. It is one long-standing introductory hub to the anonymous hidden services reachable via the Tor network. It serves as an entry website to other .onion addresses in the Tor network. Because core.onion is a hidden service, it is not accessible through the normal Internet, but requires proxying through a Tor client. It has been an entry point to the Tor network since 2007.