Network Time Protocol. Synchronizes clocks between computers. Critical for authentication and logging.
Test it now with our Port Scanner
| Port | 123 |
|---|---|
| Service | NTP |
| Protocol | TCP / UDP |
| Encrypted | Varies |
| Common Use | Network Time Protocol |
Online: Use our Port Scanner — enter your IP and port 123.
Command line:
nc -zv your-server-ip 123 (Mac/Linux)
Test-NetConnection -ComputerName your-server-ip -Port 123 (PowerShell)
Check locally:
ss -tlnp | grep :123 (Linux) netstat -an | findstr :123 (Windows)