Port 481
ph · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | ph |
Frequently asked questions
What is port 481 used for?
Port 481 is registered with the IANA for ph (TCP/UDP). Description: Ph service.
Is port 481 a well-known port?
Yes. Port 481 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 481 is open?
Locally on Linux with ss -tulpn | grep ':481\b', on Windows with netstat -ano | findstr :481. To test a remote host use Test-NetConnection <host> -Port 481 in PowerShell or nc -zv <host> 481 on Linux/macOS.
How do I open port 481 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 481/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=481/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 481" -Direction Inbound -Protocol TCP -LocalPort 481 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | ph | Ph service |
| UDP | ph | Ph service |