Port 444
snpp · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | snpp |
| Reference | RFC 1568 |
Frequently asked questions
What is port 444 used for?
Port 444 is registered with the IANA for snpp (TCP/UDP). Description: Simple Network Paging Protocol.
Is port 444 a well-known port?
Yes. Port 444 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 444 is open?
Locally on Linux with ss -tulpn | grep ':444\b', on Windows with netstat -ano | findstr :444. To test a remote host use Test-NetConnection <host> -Port 444 in PowerShell or nc -zv <host> 444 on Linux/macOS.
How do I open port 444 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 444/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=444/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 444" -Direction Inbound -Protocol TCP -LocalPort 444 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | snpp | Simple Network Paging Protocol |
| UDP | snpp | Simple Network Paging Protocol |