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Port 1918 (can-nds)

IANA assigns port 1918 to can-nds: IBM Tivole Directory Service - NDS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
can-nds TCP IBM Tivole Directory Service - NDS - -
can-nds UDP IBM Tivole Directory Service - NDS - -

Check what is listening on port 1918

Linux: is anything listening on TCP 1918?
sudo ss -tlnp 'sport = :1918'
Linux: UDP 1918
sudo ss -ulnp 'sport = :1918'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1918
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1918 '
Windows (Command Prompt)
netstat -ano | findstr :1918
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1918 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1918
From Windows
Test-NetConnection HOST -Port 1918
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1918

Block port 1918 in the firewall

ufw
sudo ufw deny 1918/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1918 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1918 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1918' -Direction Inbound -Protocol TCP -LocalPort 1918 -Action Block
ufw
sudo ufw deny 1918/udp
iptables
sudo iptables -A INPUT -p udp --dport 1918 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1918 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1918' -Direction Inbound -Protocol UDP -LocalPort 1918 -Action Block

Related ports

1916persona1917noagent1919can-dch1920can-ferret

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