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Port 1890 (wilkenlistener)

IANA assigns port 1890 to wilkenlistener: wilkenListener.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wilkenlistener TCP wilkenListener Wilken GmbH -
wilkenlistener UDP wilkenListener Wilken GmbH -

Check what is listening on port 1890

Linux: is anything listening on TCP 1890?
sudo ss -tlnp 'sport = :1890'
Linux: UDP 1890
sudo ss -ulnp 'sport = :1890'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1890
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1890 '
Windows (Command Prompt)
netstat -ano | findstr :1890
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1890 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1890
From Windows
Test-NetConnection HOST -Port 1890
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1890

Block port 1890 in the firewall

ufw
sudo ufw deny 1890/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1890 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1890 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1890' -Direction Inbound -Protocol TCP -LocalPort 1890 -Action Block
ufw
sudo ufw deny 1890/udp
iptables
sudo iptables -A INPUT -p udp --dport 1890 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1890 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1890' -Direction Inbound -Protocol UDP -LocalPort 1890 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.