Port 11971 (tibsd)

IANA assigns port 11971 to tibsd: TiBS Service.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

tibsd TCP TiBS Service Teradactyl LLC -

Registry dates for this port: registered 2019-05-17.

Linux: is anything listening on TCP 11971?

sudo ss -tlnp 'sport = :11971'

Linux / macOS: which process owns the port

sudo lsof -nP -i :11971

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':11971 '

Windows (Command Prompt)

netstat -ano | findstr :11971

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11971 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 11971

From Windows

Test-NetConnection HOST -Port 11971

ufw

sudo ufw deny 11971/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 11971 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 11971 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 11971' -Direction Inbound -Protocol TCP -LocalPort 11971 -Action Block

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