9091
Transmission Web UI
Medium RiskTCP — File Transfer
Port Overview
Port Number
9091
Service Name
Transmission Web UI
Transport Protocol
TCP
Category
File Transfer
Security Risk
Medium
Port Range
Registered (1024-49151)
What is Port 9091?
Port 9091 is the default web interface port for Transmission, a popular lightweight BitTorrent client available on Linux, macOS, and other platforms. The Transmission web interface allows remote management of torrents through a browser. It is also used by Prometheus Pushgateway for receiving pushed metrics from batch jobs.
TCP
File Transfer
Commonly Used
Security Considerations
Port 9091 (Transmission Web UI) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.
Recommendation: Keep the service updated. Monitor logs for unusual activity.