Where can I check domain and IP availability?

Question

Domain Name System

It is necessary to check 150 thousand domains per day for registration and IP addresses. Where can I send so many requests that I would not be banned?

Answer 1

To the root servers of the domain zone.
Will withstand and 150k requests per minute. There are several for each zone and use geo-balancing. The main thing is not to be too impudent. At 1k per minute, they will not be stressful.