Port 22
ssh · SCTP/TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | SCTP/TCP/UDP |
| Service | ssh |
| Reference | RFC 4251, RFC 9260 |
| Modified | 2022-02-07 |
Frequently asked questions
What is port 22 used for?
Port 22 is registered with the IANA for ssh (SCTP/TCP/UDP). Description: The Secure Shell (SSH) Protocol; SSH.
Is port 22 a well-known port?
Yes. Port 22 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 22 is open?
Locally on Linux with ss -tulpn | grep ':22\b', on Windows with netstat -ano | findstr :22. To test a remote host use Test-NetConnection <host> -Port 22 in PowerShell or nc -zv <host> 22 on Linux/macOS.
How do I open port 22 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 22/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=22/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 22" -Direction Inbound -Protocol TCP -LocalPort 22 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | ssh | The Secure Shell (SSH) Protocol |
| UDP | ssh | The Secure Shell (SSH) Protocol |
| SCTP | ssh | SSH |