HTTPfy

Port 8016 (ads-s)

IANA assigns port 8016 to ads-s: Beckhoff Automation Device Specification.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ads-s TCP Beckhoff Automation Device Specification Beckhoff Automation GmbH Co KG -

Registry dates for this port: registered 2019-02-28.

Check what is listening on port 8016

Linux: is anything listening on TCP 8016?
sudo ss -tlnp 'sport = :8016'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8016
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8016 '
Windows (Command Prompt)
netstat -ano | findstr :8016
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8016 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8016
From Windows
Test-NetConnection HOST -Port 8016

Block port 8016 in the firewall

ufw
sudo ufw deny 8016/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8016 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8016 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8016' -Direction Inbound -Protocol TCP -LocalPort 8016 -Action Block

Related ports

8011bier-echo8015cfg-cloud8017cisco-cloudsec8019qbdb

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