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// Other services

Port 3675: CallTrax Data Port

Port 3675 is assigned by IANA to calltrax (CallTrax Data Port).

3675

How calltrax works

Other services
client:3675calltraxresponse client:3675calltraxresponse

The client sends a request to port 3675 and the calltrax 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 3675 dangerous?

We have no specific security note for port 3675. 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 3675

ServicePortTransportDescriptionReferenceUpdated
calltrax 3675 TCP, UDP CallTrax Data Port - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3675, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3675'      # process listening on 3675
sudo lsof -nP -i :3675

macOS

sudo lsof -nP -i :3675

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3675 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3675
netstat -ano | findstr :3675

From another machine

nmap -p 3675 -sV <host>
sudo nmap -sU -p 3675 <host>
nc -zv <host> 3675

Block it in the firewall

sudo ufw deny 3675/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3675" -Direction Inbound -LocalPort 3675 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3675 used for?

Port 3675 is assigned by IANA to calltrax (CallTrax Data Port).

Is port 3675 TCP or UDP?

Port 3675 is registered for TCP and UDP.

Is it safe to open port 3675?

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 3675 is open?

On Linux run "ss -ltnup 'sport = :3675'", on macOS "lsof -nP -i :3675", and on Windows "netstat -ano | findstr :3675" to see the local process. From another machine, "nmap -p 3675 <host>" shows whether it is reachable.

05 Related
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