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// Other services

Port 4487: Protocol for Remote Execution over TCP

Port 4487 is assigned by IANA to prex-tcp (Protocol for Remote Execution over TCP).

4487

How prex-tcp works

Other services
client:4487prex-tcpresponse client:4487prex-tcpresponse

The client sends a request to port 4487 and the prex-tcp 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 4487 dangerous?

We have no specific security note for port 4487. 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 4487

ServicePortTransportDescriptionReferenceUpdated
prex-tcp 4487 TCP Protocol for Remote Execution over TCP - 2010-09-16
-4487-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4487, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4487'      # process listening on 4487
sudo lsof -nP -i :4487

macOS

sudo lsof -nP -i :4487

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4487 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4487
netstat -ano | findstr :4487

From another machine

nmap -p 4487 -sV <host>
nc -zv <host> 4487

Block it in the firewall

sudo ufw deny 4487/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4487" -Direction Inbound -LocalPort 4487 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4487 used for?

Port 4487 is assigned by IANA to prex-tcp (Protocol for Remote Execution over TCP).

Is port 4487 TCP or UDP?

Port 4487 is registered for TCP.

Is it safe to open port 4487?

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 4487 is open?

On Linux run "ss -ltnup 'sport = :4487'", on macOS "lsof -nP -i :4487", and on Windows "netstat -ano | findstr :4487" to see the local process. From another machine, "nmap -p 4487 <host>" shows whether it is reachable.

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