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// Other services

Port 3987: Centerline

Port 3987 is assigned by IANA to centerline (Centerline).

3987

How centerline works

Other services
client:3987centerlineresponse client:3987centerlineresponse

The client sends a request to port 3987 and the centerline 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 3987 dangerous?

We have no specific security note for port 3987. 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 3987

ServicePortTransportDescriptionReferenceUpdated
centerline 3987 TCP, UDP Centerline - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3987, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3987'      # process listening on 3987
sudo lsof -nP -i :3987

macOS

sudo lsof -nP -i :3987

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3987 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3987
netstat -ano | findstr :3987

From another machine

nmap -p 3987 -sV <host>
sudo nmap -sU -p 3987 <host>
nc -zv <host> 3987

Block it in the firewall

sudo ufw deny 3987/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3987" -Direction Inbound -LocalPort 3987 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3987 used for?

Port 3987 is assigned by IANA to centerline (Centerline).

Is port 3987 TCP or UDP?

Port 3987 is registered for TCP and UDP.

Is it safe to open port 3987?

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 3987 is open?

On Linux run "ss -ltnup 'sport = :3987'", on macOS "lsof -nP -i :3987", and on Windows "netstat -ano | findstr :3987" to see the local process. From another machine, "nmap -p 3987 <host>" shows whether it is reachable.

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