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Port 6140 (pulsonixnls)

IANA assigns port 6140 to pulsonixnls: Pulsonix Network License Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pulsonixnls TCP Pulsonix Network License Service David Manns -
pulsonixnls UDP Pulsonix Network License Service David Manns -

Registry dates for this port: registered 2008-02-28.

Check what is listening on port 6140

Linux: is anything listening on TCP 6140?
sudo ss -tlnp 'sport = :6140'
Linux: UDP 6140
sudo ss -ulnp 'sport = :6140'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6140
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6140 '
Windows (Command Prompt)
netstat -ano | findstr :6140
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6140 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6140
From Windows
Test-NetConnection HOST -Port 6140
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6140

Block port 6140 in the firewall

ufw
sudo ufw deny 6140/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6140 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6140 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6140' -Direction Inbound -Protocol TCP -LocalPort 6140 -Action Block
ufw
sudo ufw deny 6140/udp
iptables
sudo iptables -A INPUT -p udp --dport 6140 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6140 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6140' -Direction Inbound -Protocol UDP -LocalPort 6140 -Action Block

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