Port 21553
rdm-tfs · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | rdm-tfs |
| Registered | 2011-05-02 |
Frequently asked questions
What is port 21553 used for?
Port 21553 is registered with the IANA for rdm-tfs (TCP/UDP). Description: Raima RDM TFS; Reserved.
Is port 21553 a well-known port?
No. Port 21553 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 21553 is open?
Locally on Linux with ss -tulpn | grep ':21553\b', on Windows with netstat -ano | findstr :21553. To test a remote host use Test-NetConnection <host> -Port 21553 in PowerShell or nc -zv <host> 21553 on Linux/macOS.
How do I open port 21553 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 21553/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=21553/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 21553" -Direction Inbound -Protocol TCP -LocalPort 21553 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | rdm-tfs | Raima RDM TFS |
| UDP | – | Reserved |