Port 52
xns-time · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | xns-time |
Frequently asked questions
What is port 52 used for?
Port 52 is registered with the IANA for xns-time (TCP/UDP). Description: XNS Time Protocol.
Is port 52 a well-known port?
Yes. Port 52 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 52 is open?
Locally on Linux with ss -tulpn | grep ':52\b', on Windows with netstat -ano | findstr :52. To test a remote host use Test-NetConnection <host> -Port 52 in PowerShell or nc -zv <host> 52 on Linux/macOS.
How do I open port 52 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 52/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=52/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 52" -Direction Inbound -Protocol TCP -LocalPort 52 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | xns-time | XNS Time Protocol |
| UDP | xns-time | XNS Time Protocol |