The Local Peer Discovery protocol, specified as BEP-14, is an extension to the BitTorrent file-distribution system. It is designed to support the discovery of local BitTorrent peers, aiming to minimize the traffic through the Internet service provider's (ISP) channel and maximize use of higher-bandwidth local area networks (LANs).

Local Peer Discovery is implemented with HTTP-like messages on User Datagram Protocol (UDP) multicast group 239.192.152.143:6771 (IPv4) or ff15::efc0:988f (IPv6) which are administratively scoped multicast addresses. It's similar to Simple Service Discovery Protocol but sends BT-SEARCH instead of M-SEARCH:

Since implementation is simple, Local Peer Discovery is implemented in several clients (μTorrent, BitTorrent/Mainline, MonoTorrent, libtorrent and its derivatives, Transmission, aria2). An alternative multicast peer discovery protocol based on ZeroConf is published as , but is not widely adopted since it is considered too complex in comparison.