Port 8091 (jamlink)

IANA assigns port 8091 to jamlink: Jam Link Framework.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

jamlink TCP Jam Link Framework Evgeniy Filatov -

Registry dates for this port: registered 2009-11-25.

Linux: is anything listening on TCP 8091?

sudo ss -tlnp 'sport = :8091'

Linux / macOS: which process owns the port

sudo lsof -nP -i :8091

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':8091 '

Windows (Command Prompt)

netstat -ano | findstr :8091

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8091 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 8091

From Windows

Test-NetConnection HOST -Port 8091

ufw

sudo ufw deny 8091/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 8091 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 8091 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 8091' -Direction Inbound -Protocol TCP -LocalPort 8091 -Action Block

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