CyberHunter
Local dataset, no network
// Other services

Port 5748: Wildbits Tunalyzer

Port 5748 is assigned by IANA to tunalyzer (Wildbits Tunalyzer).

5748

How tunalyzer works

Other services
client:5748tunalyzerresponse client:5748tunalyzerresponse

The client sends a request to port 5748 and the tunalyzer 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 5748 dangerous?

We have no specific security note for port 5748. 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 5748

ServicePortTransportDescriptionReferenceUpdated
tunalyzer 5748 TCP, UDP Wildbits Tunalyzer - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 5748, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5748'      # process listening on 5748
sudo lsof -nP -i :5748

macOS

sudo lsof -nP -i :5748

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5748 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5748
netstat -ano | findstr :5748

From another machine

nmap -p 5748 -sV <host>
sudo nmap -sU -p 5748 <host>
nc -zv <host> 5748

Block it in the firewall

sudo ufw deny 5748/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5748" -Direction Inbound -LocalPort 5748 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5748 used for?

Port 5748 is assigned by IANA to tunalyzer (Wildbits Tunalyzer).

Is port 5748 TCP or UDP?

Port 5748 is registered for TCP and UDP.

Is it safe to open port 5748?

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 5748 is open?

On Linux run "ss -ltnup 'sport = :5748'", on macOS "lsof -nP -i :5748", and on Windows "netstat -ano | findstr :5748" to see the local process. From another machine, "nmap -p 5748 <host>" shows whether it is reachable.

05 Related
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