What is a site mirror?

Mirrors are sites located at different URLs that have the same content. To avoid duplicate information in the search results, Yandex groups such sites as mirrors:
  • Main mirror — the URL shown in search results.
  • Secondary mirror — a URL that isn't included in search results.

When the URLs are grouped, some accumulated metrics are transferred to the main mirror, for example:

  • External links of the old site are treated as external links of the new one. The External links in Yandex.Webmaster page shows URLs specified on a third-party site.
  • Original texts of the old site are handled as texts on the new site.

You can let the robot know which site it should consider the main mirror. If there are no instructions, the robot uses special algorithms to detect the main mirror.

The Yandex robot considers the following site representations as different URLs:

Site representation Example
The site is accessible at URLs with and without the "www" prefix www.example.com and example.com
The site is available over HTTP and HTTPS http://example.com and https://example.com
The site is located in different domain zones example.com and example.ru
Identical content is displayed in different domains example.com and other-example.ru
Note. Sites that differ only in the domain zone are not grouped as mirrors. To change the domain zone, make sure you set a redirect. For more information, see Moving a site.