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Port 47100 (jvl-mactalk)

IANA assigns port 47100 to jvl-mactalk: Configuration of motors connected to Industrial Ethernet.

Registered (user) port, 1024-49151 UDP

Port 47100 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
jvl-mactalk UDP Configuration of motors connected to Industrial Ethernet JVL Industri Elektronik -

Registry dates for this port: registered 2012-12-21.

Check what is listening on port 47100

Linux: UDP 47100
sudo ss -ulnp 'sport = :47100'
Linux / macOS: which process owns the port
sudo lsof -nP -i :47100
Windows (Command Prompt)
netstat -ano | findstr :47100
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 47100

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 47100

Block port 47100 in the firewall

ufw
sudo ufw deny 47100/udp
iptables
sudo iptables -A INPUT -p udp --dport 47100 -j DROP
nftables
sudo nft add rule inet filter input udp dport 47100 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 47100' -Direction Inbound -Protocol UDP -LocalPort 47100 -Action Block

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