Port 255
no service name · –
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | – |
| Service | no service name |
| Reference | RFC 1060 |
| Modified | 2024-12-20 |
Frequently asked questions
What is port 255 used for?
Port 255 is registered with the IANA for no service name (–). Description: Reserved.
Is port 255 a well-known port?
Yes. Port 255 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 255 is open?
Locally on Linux with ss -tulpn | grep ':255\b', on Windows with netstat -ano | findstr :255. To test a remote host use Test-NetConnection <host> -Port 255 in PowerShell or nc -zv <host> 255 on Linux/macOS.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| – | Reserved |