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// Other services

Port 23456: Aequus Service

Port 23456 is assigned by IANA to aequus (Aequus Service).

23456

How aequus works

Other services
client:23456aequusresponse client:23456aequusresponse

The client sends a request to port 23456 and the aequus service answers.

Transport
TCP
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 23456 dangerous?

We have no specific security note for port 23456. 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 23456

ServicePortTransportDescriptionReferenceUpdated
aequus 23456 TCP Aequus Service - 2009-02-12
-23456-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 23456, and is it reachable?

Linux

sudo ss -ltnup 'sport = :23456'      # process listening on 23456
sudo lsof -nP -i :23456

macOS

sudo lsof -nP -i :23456

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 23456 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 23456
netstat -ano | findstr :23456

From another machine

nmap -p 23456 -sV <host>
nc -zv <host> 23456

Block it in the firewall

sudo ufw deny 23456/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 23456" -Direction Inbound -LocalPort 23456 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 23456 used for?

Port 23456 is assigned by IANA to aequus (Aequus Service).

Is port 23456 TCP or UDP?

Port 23456 is registered for TCP.

Is it safe to open port 23456?

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 23456 is open?

On Linux run "ss -ltnup 'sport = :23456'", on macOS "lsof -nP -i :23456", and on Windows "netstat -ano | findstr :23456" to see the local process. From another machine, "nmap -p 23456 <host>" shows whether it is reachable.

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