TCP Port 1883 – mqtt

About TCP Port 1883

Port 1883 carries the IANA assignment for mqtt. The IANA description reads: ‘Message Queuing Telemetry Transport Protocol’. This port appears in 1 IDS rule and does not have notable malware activity indicators in our data.

IDS Rule References

1 IDS / security rule reference TCP port 1883. Treat that number as context, not a danger score. Many detection rules are written against groups of ports rather than one service, web ports especially, so common web alternate ports inherit large counts while genuinely sensitive services can show few rules or none. Presence in IDS rules does not mean traffic on this port is malicious.

Rule categories (top 1): web-application-attack (1).

Sample rule descriptions for TCP port 1883:

• ET EXPLOIT Totolink MQTT ckeckKeepAlive ipAddr Parameter Command Injection Attempt (CVE-2025-7952)

Data Sources

This information is compiled from: IANA Service Name and Transport Protocol Port Number Registry and Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range).