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Port 1804 (enl)

IANA assigns port 1804 to enl: ENL.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
enl TCP ENL Brian Olson -
enl UDP ENL Brian Olson -

Check what is listening on port 1804

Linux: is anything listening on TCP 1804?
sudo ss -tlnp 'sport = :1804'
Linux: UDP 1804
sudo ss -ulnp 'sport = :1804'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1804
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1804 '
Windows (Command Prompt)
netstat -ano | findstr :1804
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1804 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1804
From Windows
Test-NetConnection HOST -Port 1804
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1804

Block port 1804 in the firewall

ufw
sudo ufw deny 1804/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1804 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1804 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1804' -Direction Inbound -Protocol TCP -LocalPort 1804 -Action Block
ufw
sudo ufw deny 1804/udp
iptables
sudo iptables -A INPUT -p udp --dport 1804 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1804 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1804' -Direction Inbound -Protocol UDP -LocalPort 1804 -Action Block

Related ports

1802concomp11803hp-hcip-gwy1805enl-name1806musiconline

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