Port 209

qmtp · TCP/UDP

RangeSystem/well-known port (0–1023)
ProtocolTCP/UDP
Serviceqmtp
Modified2018-04-05

Frequently asked questions

What is port 209 used for?

Port 209 is registered with the IANA for qmtp (TCP/UDP). Description: The Quick Mail Transfer Protocol.

Is port 209 a well-known port?

Yes. Port 209 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 209 is open?

Locally on Linux with ss -tulpn | grep ':209\b', on Windows with netstat -ano | findstr :209. To test a remote host use Test-NetConnection <host> -Port 209 in PowerShell or nc -zv <host> 209 on Linux/macOS.

How do I open port 209 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 209/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=209/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 209" -Direction Inbound -Protocol TCP -LocalPort 209 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPqmtpThe Quick Mail Transfer Protocol
UDPqmtpThe Quick Mail Transfer Protocol

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