Port 47808 (BACnet/IP)

Building automation (HVAC, lighting, access control) over BACnet/IP (0xBAC0).

Registered (user) port, 1024-49151 UDP Industrial control (ICS/SCADA) Do not expose to the internet

Port 47808 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

What port 47808 is used for

Building automation (HVAC, lighting, access control) over BACnet/IP (0xBAC0).

Do not expose to the internet. Exposed BACnet devices let anyone change building settings; isolate building networks.

Service nameProtoDescriptionAssigneeReference

bacnet TCP Building Automation and Control Networks Coleman Brumley -

bacnet UDP Building Automation and Control Networks Coleman Brumley -

Registry dates for this port: registered 2011-02-10.

Linux: UDP 47808

sudo ss -ulnp 'sport = :47808'

Linux / macOS: which process owns the port

sudo lsof -nP -i :47808

Windows (Command Prompt)

netstat -ano | findstr :47808

Windows (PowerShell)

Get-NetUDPEndpoint -LocalPort 47808

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

nc -vzu -w 5 HOST 47808

ufw

sudo ufw deny 47808/udp

iptables

sudo iptables -A INPUT -p udp --dport 47808 -j DROP

nftables

sudo nft add rule inet filter input udp dport 47808 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 47808' -Direction Inbound -Protocol UDP -LocalPort 47808 -Action Block

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