How to set default web application?

You can set your web application as the default web application. If you set your web application as default, every DNS result that is pointing to your server will go to this web application if there is no matching app name inside your web app. If a visitor tries to access your server by using the IP Address, this web app will be served to the user.

To do this,

Step 1 : Click on Web Application on the menu.

Step 2 : Locate and click the Web App you want to make the default

Step 3 : Navigate to the side upper left menu and click on Tools

Step 4 : Click on the Set as Default Web App

The default web application will be denoted under Status with a flag.