CyberHunter
Local dataset, no network
// Other services

Port 31020: Autotrac ACP 245

Port 31020 is assigned by IANA to autotrac-acp (Autotrac ACP 245).

31020

How autotrac-acp works

Other services
client:31020autotrac-acpresponse client:31020autotrac-acpresponse

The client sends a request to port 31020 and the autotrac-acp 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 31020 dangerous?

We have no specific security note for port 31020. 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 31020

ServicePortTransportDescriptionReferenceUpdated
autotrac-acp 31020 TCP Autotrac ACP 245 - -
-31020-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 31020, and is it reachable?

Linux

sudo ss -ltnup 'sport = :31020'      # process listening on 31020
sudo lsof -nP -i :31020

macOS

sudo lsof -nP -i :31020

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 31020 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 31020
netstat -ano | findstr :31020

From another machine

nmap -p 31020 -sV <host>
nc -zv <host> 31020

Block it in the firewall

sudo ufw deny 31020/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 31020" -Direction Inbound -LocalPort 31020 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 31020 used for?

Port 31020 is assigned by IANA to autotrac-acp (Autotrac ACP 245).

Is port 31020 TCP or UDP?

Port 31020 is registered for TCP.

Is it safe to open port 31020?

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 31020 is open?

On Linux run "ss -ltnup 'sport = :31020'", on macOS "lsof -nP -i :31020", and on Windows "netstat -ano | findstr :31020" to see the local process. From another machine, "nmap -p 31020 <host>" shows whether it is reachable.

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