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// Databases & caches

Port 446: DDM-Remote Relational Database Access

Port 446 is assigned by IANA to ddm-rdb (DDM-Remote Relational Database Access).

446

How ddm-rdb works

Databases & caches
app:446ddm-rdb app:446ddm-rdb

The application sends a SQL query to the ddm-rdb server on port 446, which returns rows from its tables.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Databases & caches
01 Security

Is port 446 dangerous?

We have no specific security note for port 446. Its risk depends on the program actually listening on it. General advice for databases & caches services:

  • Bind the service to localhost or a private network, never to a public address.
  • Enable authentication, use per-application accounts and require TLS.
  • Watch for exposed Docker ports: publish them on 127.0.0.1 only.
02 Registry

IANA registry entries for port 446

ServicePortTransportDescriptionReferenceUpdated
ddm-rdb 446 TCP, UDP DDM-Remote Relational Database Access - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 446, and is it reachable?

Linux

sudo ss -ltnup 'sport = :446'      # process listening on 446
sudo lsof -nP -i :446

macOS

sudo lsof -nP -i :446

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 446 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 446
netstat -ano | findstr :446

From another machine

nmap -p 446 -sV <host>
sudo nmap -sU -p 446 <host>
nc -zv <host> 446

Block it in the firewall

sudo ufw deny 446/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 446" -Direction Inbound -LocalPort 446 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 446 used for?

Port 446 is assigned by IANA to ddm-rdb (DDM-Remote Relational Database Access).

Is port 446 TCP or UDP?

Port 446 is registered for TCP and UDP.

Is it safe to open port 446?

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. Bind the service to localhost or a private network, never to a public address.

How do I check if port 446 is open?

On Linux run "ss -ltnup 'sport = :446'", on macOS "lsof -nP -i :446", and on Windows "netstat -ano | findstr :446" to see the local process. From another machine, "nmap -p 446 <host>" shows whether it is reachable.

05 Related
:3306 MySQL / MariaDB tcp · udp · high risk :1433 Microsoft SQL Server tcp · udp · high risk :5432 PostgreSQL tcp · udp · high risk :6379 Redis tcp · critical risk :27017 MongoDB tcp · critical risk :9200 Elasticsearch tcp · udp · critical risk :1521 Oracle Database tcp · udp · high risk :11211 Memcached tcp · udp · high risk

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