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Port 5046 (vpm-udp)

IANA assigns port 5046 to vpm-udp: Vishay PM UDP Service.

Registered (user) port, 1024-49151 UDP

Port 5046 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
vpm-udp UDP Vishay PM UDP Service Ashley Clarke -

Registry dates for this port: registered 2010-06-17.

Check what is listening on port 5046

Linux: UDP 5046
sudo ss -ulnp 'sport = :5046'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5046
Windows (Command Prompt)
netstat -ano | findstr :5046
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 5046

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5046

Block port 5046 in the firewall

ufw
sudo ufw deny 5046/udp
iptables
sudo iptables -A INPUT -p udp --dport 5046 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5046 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5046' -Direction Inbound -Protocol UDP -LocalPort 5046 -Action Block

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