Port 550
new-rwho · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | new-rwho |
| Reference | n/a |
Frequently asked questions
What is port 550 used for?
Port 550 is registered with the IANA for new-rwho (TCP/UDP). Description: new-who.
Is port 550 a well-known port?
Yes. Port 550 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 550 is open?
Locally on Linux with ss -tulpn | grep ':550\b', on Windows with netstat -ano | findstr :550. To test a remote host use Test-NetConnection <host> -Port 550 in PowerShell or nc -zv <host> 550 on Linux/macOS.
How do I open port 550 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 550/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=550/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 550" -Direction Inbound -Protocol TCP -LocalPort 550 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | new-rwho | new-who |
| UDP | new-rwho | new-who |