CyberHunter
Local dataset, no network
// Other services

Port 4940: Equitrac Office

Port 4940 is assigned by IANA to eq-office-4940 (Equitrac Office).

4940

How eq-office-4940 works

Other services
client:4940eq-office-4940response client:4940eq-office-4940response

The client sends a request to port 4940 and the eq-office-4940 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 4940 dangerous?

We have no specific security note for port 4940. 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 4940

ServicePortTransportDescriptionReferenceUpdated
eq-office-4940 4940 TCP, UDP Equitrac Office - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4940, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4940'      # process listening on 4940
sudo lsof -nP -i :4940

macOS

sudo lsof -nP -i :4940

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4940 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4940
netstat -ano | findstr :4940

From another machine

nmap -p 4940 -sV <host>
sudo nmap -sU -p 4940 <host>
nc -zv <host> 4940

Block it in the firewall

sudo ufw deny 4940/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4940" -Direction Inbound -LocalPort 4940 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4940 used for?

Port 4940 is assigned by IANA to eq-office-4940 (Equitrac Office).

Is port 4940 TCP or UDP?

Port 4940 is registered for TCP and UDP.

Is it safe to open port 4940?

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 4940 is open?

On Linux run "ss -ltnup 'sport = :4940'", on macOS "lsof -nP -i :4940", and on Windows "netstat -ano | findstr :4940" to see the local process. From another machine, "nmap -p 4940 <host>" shows whether it is reachable.

05 Related
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