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// Databases & caches

Port 3204: Network Watcher DB Access

Port 3204 is assigned by IANA to netwatcher-db (Network Watcher DB Access).

3204

How netwatcher-db works

Databases & caches
app:3204netwatcher-db app:3204netwatcher-db

The application sends a SQL query to the netwatcher-db server on port 3204, 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
Registered (1024-49151)
Category
Databases & caches
01 Security

Is port 3204 dangerous?

We have no specific security note for port 3204. 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 3204

ServicePortTransportDescriptionReferenceUpdated
netwatcher-db 3204 TCP, UDP Network Watcher DB Access - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3204, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3204'      # process listening on 3204
sudo lsof -nP -i :3204

macOS

sudo lsof -nP -i :3204

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3204 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3204
netstat -ano | findstr :3204

From another machine

nmap -p 3204 -sV <host>
sudo nmap -sU -p 3204 <host>
nc -zv <host> 3204

Block it in the firewall

sudo ufw deny 3204/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3204" -Direction Inbound -LocalPort 3204 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3204 used for?

Port 3204 is assigned by IANA to netwatcher-db (Network Watcher DB Access).

Is port 3204 TCP or UDP?

Port 3204 is registered for TCP and UDP.

Is it safe to open port 3204?

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 3204 is open?

On Linux run "ss -ltnup 'sport = :3204'", on macOS "lsof -nP -i :3204", and on Windows "netstat -ano | findstr :3204" to see the local process. From another machine, "nmap -p 3204 <host>" shows whether it is reachable.

05 Related
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