CyberHunter
Local dataset, no network
// Other services

Port 9087: Classic Data Server

Port 9087 is assigned by IANA to classic (Classic Data Server).

9087

How classic works

Other services
client:9087classicresponse client:9087classicresponse

The client sends a request to port 9087 and the classic 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 9087 dangerous?

We have no specific security note for port 9087. 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 9087

ServicePortTransportDescriptionReferenceUpdated
classic 9087 TCP, UDP Classic Data Server - 2007-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 9087, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9087'      # process listening on 9087
sudo lsof -nP -i :9087

macOS

sudo lsof -nP -i :9087

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9087 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9087
netstat -ano | findstr :9087

From another machine

nmap -p 9087 -sV <host>
sudo nmap -sU -p 9087 <host>
nc -zv <host> 9087

Block it in the firewall

sudo ufw deny 9087/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9087" -Direction Inbound -LocalPort 9087 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9087 used for?

Port 9087 is assigned by IANA to classic (Classic Data Server).

Is port 9087 TCP or UDP?

Port 9087 is registered for TCP and UDP.

Is it safe to open port 9087?

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 9087 is open?

On Linux run "ss -ltnup 'sport = :9087'", on macOS "lsof -nP -i :9087", and on Windows "netstat -ano | findstr :9087" to see the local process. From another machine, "nmap -p 9087 <host>" shows whether it is reachable.

05 Related
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