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Port 447 (ddm-dfm)

IANA assigns port 447 to ddm-dfm: DDM-Distributed File Management.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ddm-dfm TCP DDM-Distributed File Management Steven Ritland -
ddm-dfm UDP DDM-Distributed File Management Steven Ritland -

Check what is listening on port 447

Linux: is anything listening on TCP 447?
sudo ss -tlnp 'sport = :447'
Linux: UDP 447
sudo ss -ulnp 'sport = :447'
Linux / macOS: which process owns the port
sudo lsof -nP -i :447
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':447 '
Windows (Command Prompt)
netstat -ano | findstr :447
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 447 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 447
From Windows
Test-NetConnection HOST -Port 447
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 447

Block port 447 in the firewall

ufw
sudo ufw deny 447/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 447 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 447 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 447' -Direction Inbound -Protocol TCP -LocalPort 447 -Action Block
ufw
sudo ufw deny 447/udp
iptables
sudo iptables -A INPUT -p udp --dport 447 -j DROP
nftables
sudo nft add rule inet filter input udp dport 447 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 447' -Direction Inbound -Protocol UDP -LocalPort 447 -Action Block

Related ports

445SMB (Microsoft-DS)446ddm-rdb448ddm-ssl449as-servermap

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