Port 31400 (pace-licensed)

IANA assigns port 31400 to pace-licensed: PACE license server.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

pace-licensed TCP PACE license server PACE Anti-Piracy -

Registry dates for this port: registered 2014-04-28.

Linux: is anything listening on TCP 31400?

sudo ss -tlnp 'sport = :31400'

Linux / macOS: which process owns the port

sudo lsof -nP -i :31400

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':31400 '

Windows (Command Prompt)

netstat -ano | findstr :31400

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 31400 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 31400

From Windows

Test-NetConnection HOST -Port 31400

ufw

sudo ufw deny 31400/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 31400 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 31400 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 31400' -Direction Inbound -Protocol TCP -LocalPort 31400 -Action Block

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