IoT & automation ports
7 iot & automation ports: what each one does, its protocol, and whether it is secure by default.
SubnetKit lists 7 iot & automation ports, using TCP, TCP/UDP, UDP. 7 of 7 are formally registered with IANA rather than just a widely followed convention.
1 of the 7 iot & automation ports is encrypted by default; the rest send data in clear text unless wrapped in TLS, SSH, or a VPN.
Click any port below for its full page: what it does, its protocol, and whether it is safe to expose.
| Port | Service | Protocol | What it does |
|---|---|---|---|
| 502 | Modbus | TCP | Modbus Protocol |
| 1883 | MQTT | TCP | MQTT publish-subscribe messaging |
| 2222 | EtherNet/IP | TCP/UDP | EtherNet/IP implicit messaging |
| 5683 | CoAP | UDP | Constrained Application Protocol |
| 8883 | MQTTS | TCP | MQTT over TLS |
| 20000 | DNP3 | TCP/UDP | Distributed Network Protocol 3 |
| 47808 | BACnet | UDP | BACnet building automation |
Frequently asked questions
Which ports are in the IoT & automation category?
port 502 (Modbus), port 1883 (MQTT), port 2222 (EtherNet/IP), port 5683 (CoAP), port 8883 (MQTTS), port 20000 (DNP3) and port 47808 (BACnet).
How many iot & automation ports does SubnetKit list?
7, covering TCP, TCP/UDP, UDP. 7 of them are formally registered with IANA.
Are iot & automation ports secure by default?
1 out of 7 are encrypted by default. Check each port's page for its specific encryption status.
Which iot & automation port has the lowest number?
Port 502 (Modbus). Port 502 is Modbus, a simple industrial protocol from the 1970s that is still the most common way PLCs and other factory-floor equipment talk to each other. It has no built-in security, which is a well-known concern in operational technology networks.