Port 6881 — BitTorrent
Quick reference for TCP/UDP port 6881, used by BitTorrent. Includes what the service does, security guidance and related ports.
What is port 6881?
BitTorrent peer port.
What port does BitTorrent use?
BitTorrent listens on port 6881 by default.
Is port 6881 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 6881
Test-NetConnection HOST -Port 6881
nmap -p 6881 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
Medium risk — open with care
Port 6881 (BitTorrent) can safely face the internet if you keep the software up to date, restrict admin endpoints, and use TLS where possible. Audit who can reach it and watch your logs.
Related ports
Frequently asked
What is port 6881 used for?+
Port 6881 is the standard TCP/UDP port for BitTorrent. BitTorrent peer port.
What port does BitTorrent use?+
BitTorrent listens on port 6881 by default.
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