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// Other services

Port 8804: truecm

Port 8804 is assigned by IANA to truecm (truecm).

8804

How truecm works

Other services
client:8804truecmresponse client:8804truecmresponse

The client sends a request to port 8804 and the truecm service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 8804 dangerous?

We have no specific security note for port 8804. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 8804

ServicePortTransportDescriptionReferenceUpdated
truecm 8804 TCP, UDP truecm - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 8804, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8804'      # process listening on 8804
sudo lsof -nP -i :8804

macOS

sudo lsof -nP -i :8804

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8804 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8804
netstat -ano | findstr :8804

From another machine

nmap -p 8804 -sV <host>
sudo nmap -sU -p 8804 <host>
nc -zv <host> 8804

Block it in the firewall

sudo ufw deny 8804/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8804" -Direction Inbound -LocalPort 8804 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8804 used for?

Port 8804 is assigned by IANA to truecm (truecm).

Is port 8804 TCP or UDP?

Port 8804 is registered for TCP and UDP.

Is it safe to open port 8804?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 8804 is open?

On Linux run "ss -ltnup 'sport = :8804'", on macOS "lsof -nP -i :8804", and on Windows "netstat -ano | findstr :8804" to see the local process. From another machine, "nmap -p 8804 <host>" shows whether it is reachable.

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