Port 9091: Transmission
Port 9091 is the default web interface port for the Transmission BitTorrent client, letting you add and manage torrents from a browser. It is a convention set by the Transmission project rather than an IANA assignment.
| Port number | 9091 |
|---|---|
| Service | Transmission BitTorrent client web UI |
| Protocol | TCP |
| Category | File transfer |
| Default encryption | No |
Frequently asked questions
What is port 9091 used for?
Port 9091 is the default web interface port for the Transmission BitTorrent client, letting you add and manage torrents from a browser. It is a convention set by the Transmission project rather than an IANA assignment.
Is port 9091 TCP or UDP?
Port 9091 (Transmission) uses TCP.
Is port 9091 secure?
Port 9091 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 9091 on my firewall?
Only if you specifically need Transmission. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.