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// Other services

Port 1890: wilkenListener

Port 1890 is assigned by IANA to wilkenlistener (wilkenListener).

1890

How wilkenlistener works

Other services
client:1890wilkenlistenerresponse client:1890wilkenlistenerresponse

The client sends a request to port 1890 and the wilkenlistener service answers.

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
Other services
01 Security

Is port 1890 dangerous?

We have no specific security note for port 1890. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1890

ServicePortTransportDescriptionReferenceUpdated
wilkenlistener 1890 TCP, UDP wilkenListener - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1890, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1890'      # process listening on 1890
sudo lsof -nP -i :1890

macOS

sudo lsof -nP -i :1890

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1890 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1890
netstat -ano | findstr :1890

From another machine

nmap -p 1890 -sV <host>
sudo nmap -sU -p 1890 <host>
nc -zv <host> 1890

Block it in the firewall

sudo ufw deny 1890/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1890" -Direction Inbound -LocalPort 1890 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1890 used for?

Port 1890 is assigned by IANA to wilkenlistener (wilkenListener).

Is port 1890 TCP or UDP?

Port 1890 is registered for TCP and UDP.

Is it safe to open port 1890?

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. Close the port if nothing on the host needs it.

How do I check if port 1890 is open?

On Linux run "ss -ltnup 'sport = :1890'", on macOS "lsof -nP -i :1890", and on Windows "netstat -ano | findstr :1890" to see the local process. From another machine, "nmap -p 1890 <host>" shows whether it is reachable.

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