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Port 448 (ddm-ssl)

IANA assigns port 448 to ddm-ssl: DDM-Remote DB Access Using Secure Sockets.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ddm-ssl TCP DDM-Remote DB Access Using Secure Sockets Steven Ritland -
ddm-ssl UDP DDM-Remote DB Access Using Secure Sockets Steven Ritland -

Check what is listening on port 448

Linux: is anything listening on TCP 448?
sudo ss -tlnp 'sport = :448'
Linux: UDP 448
sudo ss -ulnp 'sport = :448'
Linux / macOS: which process owns the port
sudo lsof -nP -i :448
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':448 '
Windows (Command Prompt)
netstat -ano | findstr :448
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 448 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 448
From Windows
Test-NetConnection HOST -Port 448
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 448

Block port 448 in the firewall

ufw
sudo ufw deny 448/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 448 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 448 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 448' -Direction Inbound -Protocol TCP -LocalPort 448 -Action Block
ufw
sudo ufw deny 448/udp
iptables
sudo iptables -A INPUT -p udp --dport 448 -j DROP
nftables
sudo nft add rule inet filter input udp dport 448 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 448' -Direction Inbound -Protocol UDP -LocalPort 448 -Action Block

Related ports

446ddm-rdb447ddm-dfm449as-servermap450tserver

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