Port 1883
mqtt · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | mqtt |
| Modified | 2015-02-10 |
Frequently asked questions
What is port 1883 used for?
Port 1883 is registered with the IANA for mqtt (TCP/UDP). Description: Message Queuing Telemetry Transport Protocol.
Is port 1883 a well-known port?
No. Port 1883 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 1883 is open?
Locally on Linux with ss -tulpn | grep ':1883\b', on Windows with netstat -ano | findstr :1883. To test a remote host use Test-NetConnection <host> -Port 1883 in PowerShell or nc -zv <host> 1883 on Linux/macOS.
How do I open port 1883 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 1883/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=1883/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 1883" -Direction Inbound -Protocol TCP -LocalPort 1883 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | mqtt | Message Queuing Telemetry Transport Protocol |
| UDP | mqtt | Message Queuing Telemetry Transport Protocol |