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Port 7509 (acplt)

IANA assigns port 7509 to acplt: ACPLT - process automation service.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
acplt TCP ACPLT - process automation service Chair for Process Control Engineering -

Registry dates for this port: registered 2010-12-07, last modified 2012-08-07.

Check what is listening on port 7509

Linux: is anything listening on TCP 7509?
sudo ss -tlnp 'sport = :7509'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7509
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7509 '
Windows (Command Prompt)
netstat -ano | findstr :7509
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7509 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7509
From Windows
Test-NetConnection HOST -Port 7509

Block port 7509 in the firewall

ufw
sudo ufw deny 7509/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7509 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7509 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7509' -Direction Inbound -Protocol TCP -LocalPort 7509 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.