Port 16665 (axon-tunnel)

IANA assigns port 16665 to axon-tunnel: Reliable multipath data transport for high latencies.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

axon-tunnel TCP Reliable multipath data transport for high latencies Bridgeworks -

Registry dates for this port: registered 2014-09-26, last modified 2026-09-11.

Linux: is anything listening on TCP 16665?

sudo ss -tlnp 'sport = :16665'

Linux / macOS: which process owns the port

sudo lsof -nP -i :16665

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':16665 '

Windows (Command Prompt)

netstat -ano | findstr :16665

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 16665 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 16665

From Windows

Test-NetConnection HOST -Port 16665

ufw

sudo ufw deny 16665/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 16665 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 16665 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 16665' -Direction Inbound -Protocol TCP -LocalPort 16665 -Action Block

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