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// Network services

Port 24850: Device Association Discovery

Port 24850 is assigned by IANA to assoc-disc (Device Association Discovery).

24850

How assoc-disc works

Network services
client:24850assoc-discresponse client:24850assoc-discresponse

The client sends a request to port 24850 and the assoc-disc service answers.

Transport
UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Network services
01 Security

Is port 24850 dangerous?

We have no specific security note for port 24850. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 24850

ServicePortTransportDescriptionReferenceUpdated
assoc-disc 24850 UDP Device Association Discovery - 2012-06-27
-24850-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 24850, and is it reachable?

Linux

sudo ss -ltnup 'sport = :24850'      # process listening on 24850
sudo lsof -nP -i :24850

macOS

sudo lsof -nP -i :24850

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 24850 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 24850
netstat -ano | findstr :24850

From another machine

nmap -p 24850 -sV <host>
sudo nmap -sU -p 24850 <host>
nc -zv <host> 24850

Block it in the firewall

sudo ufw deny 24850/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 24850" -Direction Inbound -LocalPort 24850 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 24850 used for?

Port 24850 is assigned by IANA to assoc-disc (Device Association Discovery).

Is port 24850 TCP or UDP?

Port 24850 is registered for UDP.

Is it safe to open port 24850?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 24850 is open?

On Linux run "ss -ltnup 'sport = :24850'", on macOS "lsof -nP -i :24850", and on Windows "netstat -ano | findstr :24850" to see the local process. From another machine, "nmap -p 24850 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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