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// Other services

Port 9387: D2D Configuration Service

Port 9387 is assigned by IANA to d2dconfig (D2D Configuration Service).

9387

How d2dconfig works

Other services
client:9387d2dconfigresponse client:9387d2dconfigresponse

The client sends a request to port 9387 and the d2dconfig service answers.

Transport
TCP
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 9387 dangerous?

We have no specific security note for port 9387. 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 9387

ServicePortTransportDescriptionReferenceUpdated
d2dconfig 9387 TCP D2D Configuration Service - 2008-12-24
-9387-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 9387, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9387'      # process listening on 9387
sudo lsof -nP -i :9387

macOS

sudo lsof -nP -i :9387

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9387 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9387
netstat -ano | findstr :9387

From another machine

nmap -p 9387 -sV <host>
nc -zv <host> 9387

Block it in the firewall

sudo ufw deny 9387/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9387" -Direction Inbound -LocalPort 9387 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9387 used for?

Port 9387 is assigned by IANA to d2dconfig (D2D Configuration Service).

Is port 9387 TCP or UDP?

Port 9387 is registered for TCP.

Is it safe to open port 9387?

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 9387 is open?

On Linux run "ss -ltnup 'sport = :9387'", on macOS "lsof -nP -i :9387", and on Windows "netstat -ano | findstr :9387" to see the local process. From another machine, "nmap -p 9387 <host>" shows whether it is reachable.

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