Port 5581
tmosms1 · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | tmosms1 |
| Registered | 2006-06 |
Frequently asked questions
What is port 5581 used for?
Port 5581 is registered with the IANA for tmosms1 (TCP/UDP). Description: T-Mobile SMS Protocol Message 1.
Is port 5581 a well-known port?
No. Port 5581 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 5581 is open?
Locally on Linux with ss -tulpn | grep ':5581\b', on Windows with netstat -ano | findstr :5581. To test a remote host use Test-NetConnection <host> -Port 5581 in PowerShell or nc -zv <host> 5581 on Linux/macOS.
How do I open port 5581 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 5581/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=5581/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 5581" -Direction Inbound -Protocol TCP -LocalPort 5581 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | tmosms1 | T-Mobile SMS Protocol Message 1 |
| UDP | tmosms1 | T-Mobile SMS Protocol Message 1 |