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// Other services

Port 3906: TopoVista elevation data

Port 3906 is assigned by IANA to topovista-data (TopoVista elevation data).

3906

How topovista-data works

Other services
client:3906topovista-dataresponse client:3906topovista-dataresponse

The client sends a request to port 3906 and the topovista-data 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 3906 dangerous?

We have no specific security note for port 3906. 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 3906

ServicePortTransportDescriptionReferenceUpdated
topovista-data 3906 TCP, UDP TopoVista elevation data - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3906, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3906'      # process listening on 3906
sudo lsof -nP -i :3906

macOS

sudo lsof -nP -i :3906

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3906 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3906
netstat -ano | findstr :3906

From another machine

nmap -p 3906 -sV <host>
sudo nmap -sU -p 3906 <host>
nc -zv <host> 3906

Block it in the firewall

sudo ufw deny 3906/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3906" -Direction Inbound -LocalPort 3906 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3906 used for?

Port 3906 is assigned by IANA to topovista-data (TopoVista elevation data).

Is port 3906 TCP or UDP?

Port 3906 is registered for TCP and UDP.

Is it safe to open port 3906?

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 3906 is open?

On Linux run "ss -ltnup 'sport = :3906'", on macOS "lsof -nP -i :3906", and on Windows "netstat -ano | findstr :3906" to see the local process. From another machine, "nmap -p 3906 <host>" shows whether it is reachable.

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