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// Other services

Port 23401: Novar Alarm

Port 23401 is assigned by IANA to novar-alarm (Novar Alarm).

23401

How novar-alarm works

Other services
client:23401novar-alarmresponse client:23401novar-alarmresponse

The client sends a request to port 23401 and the novar-alarm service answers.

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
Other services
01 Security

Is port 23401 dangerous?

We have no specific security note for port 23401. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 23401

ServicePortTransportDescriptionReferenceUpdated
novar-alarm 23401 TCP, UDP Novar Alarm - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 23401, and is it reachable?

Linux

sudo ss -ltnup 'sport = :23401'      # process listening on 23401
sudo lsof -nP -i :23401

macOS

sudo lsof -nP -i :23401

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 23401 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 23401
netstat -ano | findstr :23401

From another machine

nmap -p 23401 -sV <host>
sudo nmap -sU -p 23401 <host>
nc -zv <host> 23401

Block it in the firewall

sudo ufw deny 23401/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 23401" -Direction Inbound -LocalPort 23401 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 23401 used for?

Port 23401 is assigned by IANA to novar-alarm (Novar Alarm).

Is port 23401 TCP or UDP?

Port 23401 is registered for TCP and UDP.

Is it safe to open port 23401?

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. Close the port if nothing on the host needs it.

How do I check if port 23401 is open?

On Linux run "ss -ltnup 'sport = :23401'", on macOS "lsof -nP -i :23401", and on Windows "netstat -ano | findstr :23401" to see the local process. From another machine, "nmap -p 23401 <host>" shows whether it is reachable.

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