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Port 31020 (autotrac-acp)

IANA assigns port 31020 to autotrac-acp: Autotrac ACP 245.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
autotrac-acp TCP Autotrac ACP 245 Roberto Jorge Dino -

Check what is listening on port 31020

Linux: is anything listening on TCP 31020?
sudo ss -tlnp 'sport = :31020'
Linux / macOS: which process owns the port
sudo lsof -nP -i :31020
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':31020 '
Windows (Command Prompt)
netstat -ano | findstr :31020
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 31020 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 31020
From Windows
Test-NetConnection HOST -Port 31020

Block port 31020 in the firewall

ufw
sudo ufw deny 31020/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 31020 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 31020 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 31020' -Direction Inbound -Protocol TCP -LocalPort 31020 -Action Block

Related ports

30999ovobs31016ka-sddp, ka-kdp31029yawn31337Back Orifice / 'eleet'

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.