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// Other services

Port 1087: CPL Scrambler Internal

Port 1087 is assigned by IANA to cplscrambler-in (CPL Scrambler Internal).

1087

How cplscrambler-in works

Other services
client:1087cplscrambler-inresponse client:1087cplscrambler-inresponse

The client sends a request to port 1087 and the cplscrambler-in 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 1087 dangerous?

We have no specific security note for port 1087. 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 1087

ServicePortTransportDescriptionReferenceUpdated
cplscrambler-in 1087 TCP, UDP CPL Scrambler Internal - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1087, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1087'      # process listening on 1087
sudo lsof -nP -i :1087

macOS

sudo lsof -nP -i :1087

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1087 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1087
netstat -ano | findstr :1087

From another machine

nmap -p 1087 -sV <host>
sudo nmap -sU -p 1087 <host>
nc -zv <host> 1087

Block it in the firewall

sudo ufw deny 1087/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1087" -Direction Inbound -LocalPort 1087 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1087 used for?

Port 1087 is assigned by IANA to cplscrambler-in (CPL Scrambler Internal).

Is port 1087 TCP or UDP?

Port 1087 is registered for TCP and UDP.

Is it safe to open port 1087?

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 1087 is open?

On Linux run "ss -ltnup 'sport = :1087'", on macOS "lsof -nP -i :1087", and on Windows "netstat -ano | findstr :1087" to see the local process. From another machine, "nmap -p 1087 <host>" shows whether it is reachable.

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