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Port 1892 (childkey-ctrl)

IANA assigns port 1892 to childkey-ctrl: ChildKey Control.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
childkey-ctrl TCP ChildKey Control Ivan Berardinelli -
childkey-ctrl UDP ChildKey Control Ivan Berardinelli -

Check what is listening on port 1892

Linux: is anything listening on TCP 1892?
sudo ss -tlnp 'sport = :1892'
Linux: UDP 1892
sudo ss -ulnp 'sport = :1892'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1892
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1892 '
Windows (Command Prompt)
netstat -ano | findstr :1892
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1892 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1892
From Windows
Test-NetConnection HOST -Port 1892
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1892

Block port 1892 in the firewall

ufw
sudo ufw deny 1892/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1892 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1892 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1892' -Direction Inbound -Protocol TCP -LocalPort 1892 -Action Block
ufw
sudo ufw deny 1892/udp
iptables
sudo iptables -A INPUT -p udp --dport 1892 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1892 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1892' -Direction Inbound -Protocol UDP -LocalPort 1892 -Action Block

Related ports

1890wilkenlistener1891childkey-notif1893elad1894o2server-port

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