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// Other services

Port 3887: Ciphire Data Transport

Port 3887 is assigned by IANA to ciphire-data (Ciphire Data Transport).

3887

How ciphire-data works

Other services
client:3887ciphire-dataresponse client:3887ciphire-dataresponse

The client sends a request to port 3887 and the ciphire-data 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 3887 dangerous?

We have no specific security note for port 3887. 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 3887

ServicePortTransportDescriptionReferenceUpdated
ciphire-data 3887 TCP, UDP Ciphire Data Transport - 2003-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 3887, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3887'      # process listening on 3887
sudo lsof -nP -i :3887

macOS

sudo lsof -nP -i :3887

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3887 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3887
netstat -ano | findstr :3887

From another machine

nmap -p 3887 -sV <host>
sudo nmap -sU -p 3887 <host>
nc -zv <host> 3887

Block it in the firewall

sudo ufw deny 3887/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3887" -Direction Inbound -LocalPort 3887 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3887 used for?

Port 3887 is assigned by IANA to ciphire-data (Ciphire Data Transport).

Is port 3887 TCP or UDP?

Port 3887 is registered for TCP and UDP.

Is it safe to open port 3887?

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 3887 is open?

On Linux run "ss -ltnup 'sport = :3887'", on macOS "lsof -nP -i :3887", and on Windows "netstat -ano | findstr :3887" to see the local process. From another machine, "nmap -p 3887 <host>" shows whether it is reachable.

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