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// Other services

Port 9987: DSM/SCM Target Interface

Port 9987 is assigned by IANA to dsm-scm-target (DSM/SCM Target Interface).

9987

How dsm-scm-target works

Other services
client:9987dsm-scm-targetresponse client:9987dsm-scm-targetresponse

The client sends a request to port 9987 and the dsm-scm-target 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 9987 dangerous?

We have no specific security note for port 9987. 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 9987

ServicePortTransportDescriptionReferenceUpdated
dsm-scm-target 9987 TCP, UDP DSM/SCM Target Interface - 2006-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 9987, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9987'      # process listening on 9987
sudo lsof -nP -i :9987

macOS

sudo lsof -nP -i :9987

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9987 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9987
netstat -ano | findstr :9987

From another machine

nmap -p 9987 -sV <host>
sudo nmap -sU -p 9987 <host>
nc -zv <host> 9987

Block it in the firewall

sudo ufw deny 9987/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9987" -Direction Inbound -LocalPort 9987 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9987 used for?

Port 9987 is assigned by IANA to dsm-scm-target (DSM/SCM Target Interface).

Is port 9987 TCP or UDP?

Port 9987 is registered for TCP and UDP.

Is it safe to open port 9987?

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 9987 is open?

On Linux run "ss -ltnup 'sport = :9987'", on macOS "lsof -nP -i :9987", and on Windows "netstat -ano | findstr :9987" to see the local process. From another machine, "nmap -p 9987 <host>" shows whether it is reachable.

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