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// Other services

Port 4087: APplus Service

Port 4087 is assigned by IANA to applusservice (APplus Service).

4087

How applusservice works

Other services
client:4087applusserviceresponse client:4087applusserviceresponse

The client sends a request to port 4087 and the applusservice 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 4087 dangerous?

We have no specific security note for port 4087. 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 4087

ServicePortTransportDescriptionReferenceUpdated
applusservice 4087 TCP APplus Service - 2021-08-09
-4087-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4087, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4087'      # process listening on 4087
sudo lsof -nP -i :4087

macOS

sudo lsof -nP -i :4087

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4087 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4087
netstat -ano | findstr :4087

From another machine

nmap -p 4087 -sV <host>
nc -zv <host> 4087

Block it in the firewall

sudo ufw deny 4087/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4087" -Direction Inbound -LocalPort 4087 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4087 used for?

Port 4087 is assigned by IANA to applusservice (APplus Service).

Is port 4087 TCP or UDP?

Port 4087 is registered for TCP.

Is it safe to open port 4087?

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 4087 is open?

On Linux run "ss -ltnup 'sport = :4087'", on macOS "lsof -nP -i :4087", and on Windows "netstat -ano | findstr :4087" to see the local process. From another machine, "nmap -p 4087 <host>" shows whether it is reachable.

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