HTTPfy

Port 1888 (ncconfig)

IANA assigns port 1888 to ncconfig: NC Config Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ncconfig TCP NC Config Port Simon Parker -
ncconfig UDP NC Config Port Simon Parker -

Check what is listening on port 1888

Linux: is anything listening on TCP 1888?
sudo ss -tlnp 'sport = :1888'
Linux: UDP 1888
sudo ss -ulnp 'sport = :1888'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1888
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1888 '
Windows (Command Prompt)
netstat -ano | findstr :1888
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1888 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1888
From Windows
Test-NetConnection HOST -Port 1888
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1888

Block port 1888 in the firewall

ufw
sudo ufw deny 1888/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1888 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1888 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1888' -Direction Inbound -Protocol TCP -LocalPort 1888 -Action Block
ufw
sudo ufw deny 1888/udp
iptables
sudo iptables -A INPUT -p udp --dport 1888 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1888 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1888' -Direction Inbound -Protocol UDP -LocalPort 1888 -Action Block

Related ports

1886leoip1887filex-lport1889unify-adapter1890wilkenlistener

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