Rest API request limit - Dot net core 3.1

I have developed a REST API using dot net core 3.1.  I developed the same using dot net core 2.2.  While doing load test, I found that the REST API requests of all types and to all endpoints are limited in the following ways:

IP address - 8,300 requests per minute

Can someone help me to understand why the request is limited to 8300 requests per minute and where can I change it so that I can increase it.   It seems that there is a rate limit for the number of request? Please note that I developed the app with the default code provided and I have not added any other code that would change anything in the settings.

Thank in advance!