Port 17 — qotd
Quick reference for TCP/UDP port 17, used by qotd. Includes what the service does, security guidance and related ports.
What is port 17?
Quote of the Day (RFC 865).
What port does qotd use?
qotd listens on port 17 by default.
Is port 17 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 17
Test-NetConnection HOST -Port 17
nmap -p 17 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 17 (qotd) 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.
Frequently asked
What is port 17 used for?+
Port 17 is the standard TCP/UDP port for qotd. Quote of the Day (RFC 865).
What port does qotd use?+
qotd listens on port 17 by default.
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