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// Web

Port 1889: Unify Web Adapter Service

Port 1889 is assigned by IANA to unify-adapter (Unify Web Adapter Service).

1889

How unify-adapter works

Web
browser:1889unify-adapter browser:1889unify-adapter

A browser sends an HTTP request to port 1889 and the unify-adapter server sends the page back.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Web
01 Security

Is port 1889 dangerous?

We have no specific security note for port 1889. Its risk depends on the program actually listening on it. General advice for web services:

  • Serve it over HTTPS only and check the HTTP security headers.
  • Keep admin consoles and development servers off the Internet.
  • Patch the application server and remove default credentials and sample apps.
02 Registry

IANA registry entries for port 1889

ServicePortTransportDescriptionReferenceUpdated
unify-adapter 1889 TCP, UDP Unify Web Adapter Service - 2012-07-31

// source: IANA service name and port number registry

03 Check it

Which program uses port 1889, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1889'      # process listening on 1889
sudo lsof -nP -i :1889

macOS

sudo lsof -nP -i :1889

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1889 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1889
netstat -ano | findstr :1889

From another machine

nmap -p 1889 -sV <host>
sudo nmap -sU -p 1889 <host>
nc -zv <host> 1889

Block it in the firewall

sudo ufw deny 1889/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1889" -Direction Inbound -LocalPort 1889 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1889 used for?

Port 1889 is assigned by IANA to unify-adapter (Unify Web Adapter Service).

Is port 1889 TCP or UDP?

Port 1889 is registered for TCP and UDP.

Is it safe to open port 1889?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Serve it over HTTPS only and check the HTTP security headers.

How do I check if port 1889 is open?

On Linux run "ss -ltnup 'sport = :1889'", on macOS "lsof -nP -i :1889", and on Windows "netstat -ano | findstr :1889" to see the local process. From another machine, "nmap -p 1889 <host>" shows whether it is reachable.

05 Related
:443 HTTPS tcp · udp · sctp · low risk :80 HTTP tcp · udp · sctp · moderate risk :8080 HTTP alternate tcp · udp · high risk :8443 HTTPS alternate tcp · udp · moderate risk :3000 Dev servers / Grafana tcp · udp · moderate risk :5000 Flask / Docker registry / UPnP tcp · udp · moderate risk :8000 HTTP alternate (dev) tcp · udp · moderate risk :8888 Jupyter / HTTP alternate tcp · udp · high risk

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