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// Other services

Port 3745: GWRTC Call Port

Port 3745 is assigned by IANA to gw-call-port (GWRTC Call Port).

3745

How gw-call-port works

Other services
client:3745gw-call-portresponse client:3745gw-call-portresponse

The client sends a request to port 3745 and the gw-call-port 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 3745 dangerous?

We have no specific security note for port 3745. 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 3745

ServicePortTransportDescriptionReferenceUpdated
gw-call-port 3745 TCP, UDP GWRTC Call Port - 2003-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3745, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3745'      # process listening on 3745
sudo lsof -nP -i :3745

macOS

sudo lsof -nP -i :3745

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3745 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3745
netstat -ano | findstr :3745

From another machine

nmap -p 3745 -sV <host>
sudo nmap -sU -p 3745 <host>
nc -zv <host> 3745

Block it in the firewall

sudo ufw deny 3745/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3745" -Direction Inbound -LocalPort 3745 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3745 used for?

Port 3745 is assigned by IANA to gw-call-port (GWRTC Call Port).

Is port 3745 TCP or UDP?

Port 3745 is registered for TCP and UDP.

Is it safe to open port 3745?

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 3745 is open?

On Linux run "ss -ltnup 'sport = :3745'", on macOS "lsof -nP -i :3745", and on Windows "netstat -ano | findstr :3745" to see the local process. From another machine, "nmap -p 3745 <host>" shows whether it is reachable.

05 Related
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