CyberHunter
Local dataset, no network
// Other services

Port 1931: AMD SCHED

Port 1931 is assigned by IANA to amdsched (AMD SCHED).

1931

How amdsched works

Other services
client:1931amdschedresponse client:1931amdschedresponse

The client sends a request to port 1931 and the amdsched service answers.

Transport
TCP · 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
Other services
01 Security

Is port 1931 dangerous?

We have no specific security note for port 1931. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1931

ServicePortTransportDescriptionReferenceUpdated
amdsched 1931 TCP, UDP AMD SCHED - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1931, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1931'      # process listening on 1931
sudo lsof -nP -i :1931

macOS

sudo lsof -nP -i :1931

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1931 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1931
netstat -ano | findstr :1931

From another machine

nmap -p 1931 -sV <host>
sudo nmap -sU -p 1931 <host>
nc -zv <host> 1931

Block it in the firewall

sudo ufw deny 1931/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1931" -Direction Inbound -LocalPort 1931 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1931 used for?

Port 1931 is assigned by IANA to amdsched (AMD SCHED).

Is port 1931 TCP or UDP?

Port 1931 is registered for TCP and UDP.

Is it safe to open port 1931?

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. Close the port if nothing on the host needs it.

How do I check if port 1931 is open?

On Linux run "ss -ltnup 'sport = :1931'", on macOS "lsof -nP -i :1931", and on Windows "netstat -ano | findstr :1931" to see the local process. From another machine, "nmap -p 1931 <host>" shows whether it is reachable.

05 Related
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