How to get precise indexed page number from a certain domain or a certain site?

How to get precise indexed page number from a certain domain or a certain site? - Google Search Console is a free application that allows you to identify, troubleshoot, and resolve any issues that Google may encounter as it crawls and attempts to index your website in search results. If you’re not the most technical person in the world, some of the errors you’re likely to encounter there may leave you scratching your head. We wanted to make it a bit easier, so we put together this handy set of tips about google-search, search-engine-indexing, google-index, to guide you along the way. Read the discuss below, we share some tips to fix the issue about How to get precise indexed page number from a certain domain or a certain site?.Problem :

When conducting competitor analysis, we use "site" command to get the indexed page number from a certain domain or a certain site.

But it seems that I cannot get the correct(or precise) number.

For example,

"site:sample.com", I get about 10000 results.

"site:a.sample.com" I get about 20000 results.

"a.sample.com" is a subset of "sample.com", i.e., the indexed page number of "site:a.sample.com" should be less than the indexed page number of "site:sample.com".

Do I misuse the "site" command?

Are there any other better solutions to get correct(or precise) indexed page number from a certain domain or a certain site?

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Some people said that google search does not display all the indexed page results.
Refer to this article:
Why the number of indexed pages decreased for a “site:” search

Are there any official articles about this subject?

Solution :

Are you talking about site:www.sample.com vs site:a.sample.com OR site:sample.com vs site:a.sample.com

Google usually shows all subdomains when you do site:sample.com including results from a.sample.com but if you do site:www.sample.com (where www is a subdomain), it shows only results from www.sample.com.

Even in case of site:sample.com vs site:a.sample.com, the results count may vary a lot because site: is not a reliable source of getting true number of indexed pages. I personally have seen large differences in indexed pages when comparing site: to webmasters count.

Are there any other better solutions to get correct(or precise)
indexed page number from a certain domain or a certain site?

Google webmasters is precise but that's for websites you own. Also, how comparing 'count of indexed pages' of competitors is helpful to you? It's just a number indicating indexed pages with no bearing on ranking. Probably, the only helpful inference you can draw from it is how deeply google is indexing your competitor's website and I believe site: may be good enough indicator of that.

If the issue about google-search, search-engine-indexing, google-index, is resolved, there’s a good chance that your content will get indexed and you’ll start to show up in Google search results. This means a greater chance to drive organic search traffic to your site.