UDP 51413
Synopsis
- Transmission BitTorrent client uses UDP port 51413 by default for peer traffic, including uTP (Micro Transport Protocol) and DHT communications.
- This applies to Transmission on macOS, Linux, FreeBSD, and Windows, as well as transmission-daemon on headless servers.
- NAS platforms running Transmission—such as Synology and QNAP via community packages, and TrueNAS/FreeNAS plugins—commonly expose UDP 51413 for torrent peer connections.
- OpenWrt routers running the transmission-daemon package also default to UDP 51413 unless reconfigured.
- Many Transmission Docker images map UDP 51413 for inbound BitTorrent traffic.
Observed activity
Last 30 days
Detailed chart