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// Network services

Port 20012: Samsung Interdevice Interaction discovery

Port 20012 is assigned by IANA to ss-idi-disc (Samsung Interdevice Interaction discovery).

20012

How ss-idi-disc works

Network services
client:20012ss-idi-discresponse client:20012ss-idi-discresponse

The client sends a request to port 20012 and the ss-idi-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 20012 dangerous?

We have no specific security note for port 20012. 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 20012

ServicePortTransportDescriptionReferenceUpdated
ss-idi-disc 20012 UDP Samsung Interdevice Interaction discovery - -
-20012-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 20012, and is it reachable?

Linux

sudo ss -ltnup 'sport = :20012'      # process listening on 20012
sudo lsof -nP -i :20012

macOS

sudo lsof -nP -i :20012

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 20012 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 20012
netstat -ano | findstr :20012

From another machine

nmap -p 20012 -sV <host>
sudo nmap -sU -p 20012 <host>
nc -zv <host> 20012

Block it in the firewall

sudo ufw deny 20012/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 20012" -Direction Inbound -LocalPort 20012 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 20012 used for?

Port 20012 is assigned by IANA to ss-idi-disc (Samsung Interdevice Interaction discovery).

Is port 20012 TCP or UDP?

Port 20012 is registered for UDP.

Is it safe to open port 20012?

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 20012 is open?

On Linux run "ss -ltnup 'sport = :20012'", on macOS "lsof -nP -i :20012", and on Windows "netstat -ano | findstr :20012" to see the local process. From another machine, "nmap -p 20012 <host>" shows whether it is reachable.

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