Port 473
hybrid-pop · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | hybrid-pop |
Frequently asked questions
What is port 473 used for?
Port 473 is registered with the IANA for hybrid-pop (TCP/UDP). Description: hybrid-pop.
Is port 473 a well-known port?
Yes. Port 473 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 473 is open?
Locally on Linux with ss -tulpn | grep ':473\b', on Windows with netstat -ano | findstr :473. To test a remote host use Test-NetConnection <host> -Port 473 in PowerShell or nc -zv <host> 473 on Linux/macOS.
How do I open port 473 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 473/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=473/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 473" -Direction Inbound -Protocol TCP -LocalPort 473 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | hybrid-pop | hybrid-pop |
| UDP | hybrid-pop | hybrid-pop |