We are transferring a couple of domains to Google Domains to try it out.

Before finalizing the transfer, there's a Detect and import my domain's current settings option.

Google was able to find all our A, MX, CNAME and TXT records.

How is this possible? Is there a mechanism in place to do zone transfers between registrars? I know you can't get the records via normal DNS queries.

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    Make a foo.bar.example.com record and see if they can find it. I'll bet they're just trying a best-guess situation. – ceejayoz Apr 1 '15 at 16:49

@ceejayoz is right; they just do lookups for common DNS records including Google Apps records which we have.

Found some documentation on this:

Google domains will perform a DNS lookup to look up the resource records associated with the most common subdomains (@, www, blog, etc).

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