Did you know Google has an API service to fetch DNS records ?

For example, if you want to get the MX records of techcrunch.com, you can get it from here : https://dns.google/query?name=techcrunch.com&rr_type=MX&ecs= where the API endpoint is at https://dns.google/resolve?name=techcrunch.com&type=MX after which you can parse the data.

And the best part ? - its CORS enabled. Meaning you can fetch from client side JavaScript itself from any IP address.

Here's a demo to play with : https://anjanesh.s3.amazonaws.com/demo/google-dns.html