CyberHunter
Local dataset, no network
// Other services

Port 4326: Cadcorp GeognoSIS

Port 4326 is assigned by IANA to geognosis (Cadcorp GeognoSIS).

4326

How geognosis works

Other services
client:4326geognosisresponse client:4326geognosisresponse

The client sends a request to port 4326 and the geognosis 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 4326 dangerous?

We have no specific security note for port 4326. 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 4326

ServicePortTransportDescriptionReferenceUpdated
geognosis 4326 TCP, UDP Cadcorp GeognoSIS - 2022-08-12

// source: IANA service name and port number registry

03 Check it

Which program uses port 4326, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4326'      # process listening on 4326
sudo lsof -nP -i :4326

macOS

sudo lsof -nP -i :4326

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4326 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4326
netstat -ano | findstr :4326

From another machine

nmap -p 4326 -sV <host>
sudo nmap -sU -p 4326 <host>
nc -zv <host> 4326

Block it in the firewall

sudo ufw deny 4326/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4326" -Direction Inbound -LocalPort 4326 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4326 used for?

Port 4326 is assigned by IANA to geognosis (Cadcorp GeognoSIS).

Is port 4326 TCP or UDP?

Port 4326 is registered for TCP and UDP.

Is it safe to open port 4326?

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 4326 is open?

On Linux run "ss -ltnup 'sport = :4326'", on macOS "lsof -nP -i :4326", and on Windows "netstat -ano | findstr :4326" to see the local process. From another machine, "nmap -p 4326 <host>" shows whether it is reachable.

05 Related
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