CyberHunter
Local dataset, no network
// Other services

Port 8809: MCPTT Off-Network Protocol (MONP)

Port 8809 is assigned by IANA to 3gpp-monp (MCPTT Off-Network Protocol (MONP)).

8809

How 3gpp-monp works

Other services
client:88093gpp-monpresponse client:88093gpp-monpresponse

The client sends a request to port 8809 and the 3gpp-monp service answers.

Transport
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 8809 dangerous?

We have no specific security note for port 8809. 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 8809

ServicePortTransportDescriptionReferenceUpdated
3gpp-monp 8809 UDP MCPTT Off-Network Protocol (MONP) 3GPP TS 24.379 v13.5.0s 2026-01-23
-8809-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8809, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8809'      # process listening on 8809
sudo lsof -nP -i :8809

macOS

sudo lsof -nP -i :8809

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8809 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8809
netstat -ano | findstr :8809

From another machine

nmap -p 8809 -sV <host>
sudo nmap -sU -p 8809 <host>
nc -zv <host> 8809

Block it in the firewall

sudo ufw deny 8809/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8809" -Direction Inbound -LocalPort 8809 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 8809 used for?

Port 8809 is assigned by IANA to 3gpp-monp (MCPTT Off-Network Protocol (MONP)).

Is port 8809 TCP or UDP?

Port 8809 is registered for UDP.

Is it safe to open port 8809?

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 8809 is open?

On Linux run "ss -ltnup 'sport = :8809'", on macOS "lsof -nP -i :8809", and on Windows "netstat -ano | findstr :8809" to see the local process. From another machine, "nmap -p 8809 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news