Messaging & Chat

Port 1883

MQTT

Lightweight publish-subscribe messaging for IoT devices (MQTT)

Port
1883
Protocol
TCP
Service
MQTT
Security
Restricted
Full name: Message Queuing Telemetry Transport

What is port 1883?

MQTT on port 1883 is a lightweight publish-subscribe messaging protocol designed for IoT devices with limited power and bandwidth. It is used by smart home devices, industrial sensors, and telemetry systems. The connection is unencrypted — use MQTT over TLS (port 8883) for any internet-facing deployment. Thousands of open MQTT brokers on the internet inadvertently expose sensitive IoT data including sensor readings and control commands.

Related ports

Port 8883 MQTT-TLS MQTT over TLS — encrypted IoT messaging
Port 5672 AMQP RabbitMQ message broker using the AMQP protocol
← All ports