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Port 1919 (can-dch)

IANA assigns port 1919 to can-dch: IBM Tivoli Directory Service - DCH.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
can-dch TCP IBM Tivoli Directory Service - DCH - -
can-dch UDP IBM Tivoli Directory Service - DCH - -

Check what is listening on port 1919

Linux: is anything listening on TCP 1919?
sudo ss -tlnp 'sport = :1919'
Linux: UDP 1919
sudo ss -ulnp 'sport = :1919'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1919
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1919 '
Windows (Command Prompt)
netstat -ano | findstr :1919
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1919 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1919
From Windows
Test-NetConnection HOST -Port 1919
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1919

Block port 1919 in the firewall

ufw
sudo ufw deny 1919/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1919 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1919 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1919' -Direction Inbound -Protocol TCP -LocalPort 1919 -Action Block
ufw
sudo ufw deny 1919/udp
iptables
sudo iptables -A INPUT -p udp --dport 1919 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1919 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1919' -Direction Inbound -Protocol UDP -LocalPort 1919 -Action Block

Related ports

1917noagent1918can-nds1920can-ferret1921noadmin

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