DHT bootstrapping is an implementation detail, not part of the protocol. You don't need DNS or any dedicated bootstrapping mechanism since any node in the netwo

DHT bootstrapping is an implementation detail, not part of the protocol. You don't need DNS or any dedicated bootstrapping mechanism since any node in the network can be used to join it. You could call your friend and ask for the IP and port of his bittorrent client. So the protocol is fully decentralized. Implementations tend to use bootstrapping mechanisms that rely on an expandable, customizable list of known bootstrap nodes, but this is not essential.