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Port 24850 (assoc-disc)

IANA assigns port 24850 to assoc-disc: Device Association Discovery.

Registered (user) port, 1024-49151 UDP

Port 24850 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
assoc-disc UDP Device Association Discovery Microsoft Corporation 3 -

Registry dates for this port: registered 2012-06-27.

Check what is listening on port 24850

Linux: UDP 24850
sudo ss -ulnp 'sport = :24850'
Linux / macOS: which process owns the port
sudo lsof -nP -i :24850
Windows (Command Prompt)
netstat -ano | findstr :24850
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 24850

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 24850

Block port 24850 in the firewall

ufw
sudo ufw deny 24850/udp
iptables
sudo iptables -A INPUT -p udp --dport 24850 -j DROP
nftables
sudo nft add rule inet filter input udp dport 24850 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 24850' -Direction Inbound -Protocol UDP -LocalPort 24850 -Action Block

Related ports

24680tcc-http24754cslg24922find25000icl-twobase1

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