Port 1880: Node-RED
Port 1880 is the default port for Node-RED, a visual automation tool popular in home automation.
What runs on port 1880
Node-RED is a browser-based tool for wiring together devices, APIs and logic as flows. Its editor and any HTTP endpoints you build are served on TCP 1880. It is widely used with Home Assistant, MQTT and on Raspberry Pis.
On a home network
Raspberry Pis, home servers and Home Assistant installs running the Node-RED add-on listen on 1880.
If port 1880 is reachable from the internet
The Node-RED editor has no login unless you configure one, and anyone who can open it can deploy flows that run commands on the machine. Exposed, unauthenticated Node-RED instances are easy to find and effectively hand over the host. Never expose 1880 without authentication, and prefer a VPN.
How to check whether it is open on your network
Open Node-RED's settings file and confirm adminAuth is set. RECON's Exposure Check tells you whether 1880 answers on your public address.
To find out whether port 1880 is open on something in your home, and whether the internet can reach it, the app scans your Wi-Fi from your phone and checks your public address from the outside. It says what it checked and what it could not. Get RECON for iPhone — one-time purchase, no account, nothing leaves the device.