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// Other services

Port 3756: Canon CAPT Port

Port 3756 is assigned by IANA to canon-capt (Canon CAPT Port).

3756

How canon-capt works

Other services
client:3756canon-captresponse client:3756canon-captresponse

The client sends a request to port 3756 and the canon-capt 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 3756 dangerous?

We have no specific security note for port 3756. 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 3756

ServicePortTransportDescriptionReferenceUpdated
canon-capt 3756 TCP, UDP Canon CAPT Port - 2003-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3756, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3756'      # process listening on 3756
sudo lsof -nP -i :3756

macOS

sudo lsof -nP -i :3756

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3756 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3756
netstat -ano | findstr :3756

From another machine

nmap -p 3756 -sV <host>
sudo nmap -sU -p 3756 <host>
nc -zv <host> 3756

Block it in the firewall

sudo ufw deny 3756/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3756" -Direction Inbound -LocalPort 3756 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3756 used for?

Port 3756 is assigned by IANA to canon-capt (Canon CAPT Port).

Is port 3756 TCP or UDP?

Port 3756 is registered for TCP and UDP.

Is it safe to open port 3756?

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 3756 is open?

On Linux run "ss -ltnup 'sport = :3756'", on macOS "lsof -nP -i :3756", and on Windows "netstat -ano | findstr :3756" to see the local process. From another machine, "nmap -p 3756 <host>" shows whether it is reachable.

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