Port 17
qotd · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | qotd |
Frequently asked questions
What is port 17 used for?
Port 17 is registered with the IANA for qotd (TCP/UDP). Description: Quote of the Day.
Is port 17 a well-known port?
Yes. Port 17 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 17 is open?
Locally on Linux with ss -tulpn | grep ':17\b', on Windows with netstat -ano | findstr :17. To test a remote host use Test-NetConnection <host> -Port 17 in PowerShell or nc -zv <host> 17 on Linux/macOS.
How do I open port 17 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 17/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=17/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 17" -Direction Inbound -Protocol TCP -LocalPort 17 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | qotd | Quote of the Day |
| UDP | qotd | Quote of the Day |