- 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.
Port 9387: D2D Configuration Service
Port 9387 is assigned by IANA to d2dconfig (D2D Configuration Service).
9387
How d2dconfig works
Other servicesThe 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
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:
IANA registry entries for port 9387
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| d2dconfig | 9387 | TCP | D2D Configuration Service | - | 2008-12-24 |
| - | 9387 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 9387, and is it reachable?
Linux
sudo ss -ltnup 'sport = :9387' # process listening on 9387
sudo lsof -nP -i :9387macOS
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
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.
Other other services ports
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp