- 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 4087: APplus Service
Port 4087 is assigned by IANA to applusservice (APplus Service).
4087
How applusservice works
Other servicesThe 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
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:
IANA registry entries for port 4087
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| applusservice | 4087 | TCP | APplus Service | - | 2021-08-09 |
| - | 4087 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 4087, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4087' # process listening on 4087
sudo lsof -nP -i :4087macOS
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
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.
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