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// Other services

Port 4047: Context Transfer Protocol

Port 4047 is assigned by IANA to ctp-state (Context Transfer Protocol).

4047

How ctp-state works

Other services
client:4047ctp-stateresponse client:4047ctp-stateresponse

The client sends a request to port 4047 and the ctp-state 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 4047 dangerous?

We have no specific security note for port 4047. 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 4047

ServicePortTransportDescriptionReferenceUpdated
ctp-state 4047 TCP, UDP Context Transfer Protocol - 2005-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 4047, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4047'      # process listening on 4047
sudo lsof -nP -i :4047

macOS

sudo lsof -nP -i :4047

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4047 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4047
netstat -ano | findstr :4047

From another machine

nmap -p 4047 -sV <host>
sudo nmap -sU -p 4047 <host>
nc -zv <host> 4047

Block it in the firewall

sudo ufw deny 4047/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4047" -Direction Inbound -LocalPort 4047 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4047 used for?

Port 4047 is assigned by IANA to ctp-state (Context Transfer Protocol).

Is port 4047 TCP or UDP?

Port 4047 is registered for TCP and UDP.

Is it safe to open port 4047?

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 4047 is open?

On Linux run "ss -ltnup 'sport = :4047'", on macOS "lsof -nP -i :4047", and on Windows "netstat -ano | findstr :4047" to see the local process. From another machine, "nmap -p 4047 <host>" shows whether it is reachable.

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