CyberHunter
Local dataset, no network
// Other services

Port 3749: CimTrak

Port 3749 is assigned by IANA to cimtrak (CimTrak).

3749

How cimtrak works

Other services
client:3749cimtrakresponse client:3749cimtrakresponse

The client sends a request to port 3749 and the cimtrak 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 3749 dangerous?

We have no specific security note for port 3749. 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 3749

ServicePortTransportDescriptionReferenceUpdated
cimtrak 3749 TCP, UDP CimTrak - 2003-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3749, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3749'      # process listening on 3749
sudo lsof -nP -i :3749

macOS

sudo lsof -nP -i :3749

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3749 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3749
netstat -ano | findstr :3749

From another machine

nmap -p 3749 -sV <host>
sudo nmap -sU -p 3749 <host>
nc -zv <host> 3749

Block it in the firewall

sudo ufw deny 3749/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3749" -Direction Inbound -LocalPort 3749 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3749 used for?

Port 3749 is assigned by IANA to cimtrak (CimTrak).

Is port 3749 TCP or UDP?

Port 3749 is registered for TCP and UDP.

Is it safe to open port 3749?

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 3749 is open?

On Linux run "ss -ltnup 'sport = :3749'", on macOS "lsof -nP -i :3749", and on Windows "netstat -ano | findstr :3749" to see the local process. From another machine, "nmap -p 3749 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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