Port 8011 (bier-echo)

IANA assigns port 8011 to bier-echo: The UDP destination port number for the IP/UDP encapsulated BIER Echo Reply message..

Registered (user) port, 1024-49151 UDP

Port 8011 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference

bier-echo UDP The UDP destination port number for the IP/UDP encapsulated BIER Echo Reply message. IESG RFC-ietf-bier-ping-29

Registry dates for this port: registered 2026-10-22.

Linux: UDP 8011

sudo ss -ulnp 'sport = :8011'

Linux / macOS: which process owns the port

sudo lsof -nP -i :8011

Windows (Command Prompt)

netstat -ano | findstr :8011

Windows (PowerShell)

Get-NetUDPEndpoint -LocalPort 8011

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 8011

ufw

sudo ufw deny 8011/udp

iptables

sudo iptables -A INPUT -p udp --dport 8011 -j DROP

nftables

sudo nft add rule inet filter input udp dport 8011 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 8011' -Direction Inbound -Protocol UDP -LocalPort 8011 -Action Block

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.