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// Databases & caches

Port 23400: Novar Data

Port 23400 is assigned by IANA to novar-dbase (Novar Data).

23400

How novar-dbase works

Databases & caches
app:23400novar-dbase app:23400novar-dbase

The application sends a SQL query to the novar-dbase server on port 23400, 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 23400 dangerous?

We have no specific security note for port 23400. 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 23400

ServicePortTransportDescriptionReferenceUpdated
novar-dbase 23400 TCP, UDP Novar Data - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 23400, and is it reachable?

Linux

sudo ss -ltnup 'sport = :23400'      # process listening on 23400
sudo lsof -nP -i :23400

macOS

sudo lsof -nP -i :23400

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 23400 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 23400
netstat -ano | findstr :23400

From another machine

nmap -p 23400 -sV <host>
sudo nmap -sU -p 23400 <host>
nc -zv <host> 23400

Block it in the firewall

sudo ufw deny 23400/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 23400" -Direction Inbound -LocalPort 23400 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 23400 used for?

Port 23400 is assigned by IANA to novar-dbase (Novar Data).

Is port 23400 TCP or UDP?

Port 23400 is registered for TCP and UDP.

Is it safe to open port 23400?

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 23400 is open?

On Linux run "ss -ltnup 'sport = :23400'", on macOS "lsof -nP -i :23400", and on Windows "netstat -ano | findstr :23400" to see the local process. From another machine, "nmap -p 23400 <host>" shows whether it is reachable.

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