Port 685
mdc-portmapper · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | mdc-portmapper |
Frequently asked questions
What is port 685 used for?
Port 685 is registered with the IANA for mdc-portmapper (TCP/UDP). Description: MDC Port Mapper.
Is port 685 a well-known port?
Yes. Port 685 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 685 is open?
Locally on Linux with ss -tulpn | grep ':685\b', on Windows with netstat -ano | findstr :685. To test a remote host use Test-NetConnection <host> -Port 685 in PowerShell or nc -zv <host> 685 on Linux/macOS.
How do I open port 685 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 685/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=685/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 685" -Direction Inbound -Protocol TCP -LocalPort 685 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | mdc-portmapper | MDC Port Mapper |
| UDP | mdc-portmapper | MDC Port Mapper |