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Port 8809 (3gpp-monp)

IANA assigns port 8809 to 3gpp-monp: MCPTT Off-Network Protocol (MONP).

Registered (user) port, 1024-49151 UDP

Port 8809 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
3gpp-monp UDP MCPTT Off-Network Protocol (MONP) 3GPP 3GPP TS 24.379 v13.5.0s

Registry dates for this port: registered 2019-04-15, last modified 2026-01-23.

Check what is listening on port 8809

Linux: UDP 8809
sudo ss -ulnp 'sport = :8809'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8809
Windows (Command Prompt)
netstat -ano | findstr :8809
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 8809

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8809

Block port 8809 in the firewall

ufw
sudo ufw deny 8809/udp
iptables
sudo iptables -A INPUT -p udp --dport 8809 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8809 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8809' -Direction Inbound -Protocol UDP -LocalPort 8809 -Action Block

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