HTTPfy

Port 16020 (jwpc)

IANA assigns port 16020 to jwpc: Filemaker Java Web Publishing Core.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
jwpc TCP Filemaker Java Web Publishing Core Robert Parks -

Registry dates for this port: registered 2010-05-12.

Check what is listening on port 16020

Linux: is anything listening on TCP 16020?
sudo ss -tlnp 'sport = :16020'
Linux / macOS: which process owns the port
sudo lsof -nP -i :16020
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':16020 '
Windows (Command Prompt)
netstat -ano | findstr :16020
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 16020 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 16020
From Windows
Test-NetConnection HOST -Port 16020

Block port 16020 in the firewall

ufw
sudo ufw deny 16020/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 16020 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 16020 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 16020' -Direction Inbound -Protocol TCP -LocalPort 16020 -Action Block

Related ports

16002gsms16003alfin16021jwpc-bin16161sun-sea-port

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