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// Other services

Port 3748: webData

Port 3748 is assigned by IANA to webdata (webData).

3748

How webdata works

Other services
client:3748webdataresponse client:3748webdataresponse

The client sends a request to port 3748 and the webdata 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 3748 dangerous?

We have no specific security note for port 3748. 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 3748

ServicePortTransportDescriptionReferenceUpdated
webdata 3748 TCP, UDP webData - 2003-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3748, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3748'      # process listening on 3748
sudo lsof -nP -i :3748

macOS

sudo lsof -nP -i :3748

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3748 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3748
netstat -ano | findstr :3748

From another machine

nmap -p 3748 -sV <host>
sudo nmap -sU -p 3748 <host>
nc -zv <host> 3748

Block it in the firewall

sudo ufw deny 3748/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3748" -Direction Inbound -LocalPort 3748 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3748 used for?

Port 3748 is assigned by IANA to webdata (webData).

Is port 3748 TCP or UDP?

Port 3748 is registered for TCP and UDP.

Is it safe to open port 3748?

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 3748 is open?

On Linux run "ss -ltnup 'sport = :3748'", on macOS "lsof -nP -i :3748", and on Windows "netstat -ano | findstr :3748" to see the local process. From another machine, "nmap -p 3748 <host>" shows whether it is reachable.

05 Related
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