HTTPfy

Port 6509 (mgcs-mfp-port)

IANA assigns port 6509 to mgcs-mfp-port: MGCS-MFP Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mgcs-mfp-port TCP MGCS-MFP Port Minoru Ozaki -
mgcs-mfp-port UDP MGCS-MFP Port Minoru Ozaki -

Check what is listening on port 6509

Linux: is anything listening on TCP 6509?
sudo ss -tlnp 'sport = :6509'
Linux: UDP 6509
sudo ss -ulnp 'sport = :6509'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6509
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6509 '
Windows (Command Prompt)
netstat -ano | findstr :6509
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6509 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6509
From Windows
Test-NetConnection HOST -Port 6509
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6509

Block port 6509 in the firewall

ufw
sudo ufw deny 6509/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6509 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6509 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6509' -Direction Inbound -Protocol TCP -LocalPort 6509 -Action Block
ufw
sudo ufw deny 6509/udp
iptables
sudo iptables -A INPUT -p udp --dport 6509 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6509 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6509' -Direction Inbound -Protocol UDP -LocalPort 6509 -Action Block

Related ports

6507bdir-priv, bdir_priv6508bdir-pub, bdir_pub6510mcer-port6511dccp-udp

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