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Port 15999 (programmar)

IANA assigns port 15999 to programmar: ProGrammar Enterprise.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
programmar TCP ProGrammar Enterprise Norman Wilson -

Registry dates for this port: registered 2010-10-06.

Check what is listening on port 15999

Linux: is anything listening on TCP 15999?
sudo ss -tlnp 'sport = :15999'
Linux / macOS: which process owns the port
sudo lsof -nP -i :15999
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':15999 '
Windows (Command Prompt)
netstat -ano | findstr :15999
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 15999 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 15999
From Windows
Test-NetConnection HOST -Port 15999

Block port 15999 in the firewall

ufw
sudo ufw deny 15999/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 15999 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 15999 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 15999' -Direction Inbound -Protocol TCP -LocalPort 15999 -Action Block

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