Port 675
dctp · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | dctp |
Frequently asked questions
What is port 675 used for?
Port 675 is registered with the IANA for dctp (TCP/UDP). Description: DCTP.
Is port 675 a well-known port?
Yes. Port 675 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 675 is open?
Locally on Linux with ss -tulpn | grep ':675\b', on Windows with netstat -ano | findstr :675. To test a remote host use Test-NetConnection <host> -Port 675 in PowerShell or nc -zv <host> 675 on Linux/macOS.
How do I open port 675 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 675/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=675/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 675" -Direction Inbound -Protocol TCP -LocalPort 675 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | dctp | DCTP |
| UDP | dctp | DCTP |