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Port 8804 (truecm)

IANA assigns port 8804 to truecm.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
truecm TCP truecm Scott Kramer -
truecm UDP truecm Scott Kramer -

Check what is listening on port 8804

Linux: is anything listening on TCP 8804?
sudo ss -tlnp 'sport = :8804'
Linux: UDP 8804
sudo ss -ulnp 'sport = :8804'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8804
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8804 '
Windows (Command Prompt)
netstat -ano | findstr :8804
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8804 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8804
From Windows
Test-NetConnection HOST -Port 8804
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8804

Block port 8804 in the firewall

ufw
sudo ufw deny 8804/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8804 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8804 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8804' -Direction Inbound -Protocol TCP -LocalPort 8804 -Action Block
ufw
sudo ufw deny 8804/udp
iptables
sudo iptables -A INPUT -p udp --dport 8804 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8804 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8804' -Direction Inbound -Protocol UDP -LocalPort 8804 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.