Advice and answers from the Ahrefs Team

It is to be noted that we treat URLs with and without the “www” as two separate URLs, so the number of results reported for them differs.

For example, when you analyse domain.com in Site Explorer 'subdomains' mode, you get data (backlinks) for domain.com + www.domain.com.

To be more exact, backlinks will be shown for both: domain.com and www.domain.com .

When you analyse www.domain.com in Site Explorer 'subdomains' mode, you get data (backlinks) for www.domain.com only, without domain.com .

To be more exact, backlinks will be shown for www.domain.com only.

Thus, to get complete set of results, it is advisable to analyse domain.com in Site Explorer 'subdomains' mode.

 

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