The most widely used DHT is Kademlia from Petar Maymounkov and David Mazières. It is used in Ethereum, IPFS, I2P, Gnutella DHT, and many other applications.

https://en.wikipedia.org/wiki/Kademlia

https://pdos.csail.mit.edu/~petar/papers/maymounkov-kademlia...

https://web.archive.org/web/20120128120732/http://www.cs.ric...