hreflang
An annotation declaring alternate language or regional versions of a page, so search engines serve the appropriate one to each user.
InternationalIP-based redirectsLanguage detection
Automatic locale redirection
Redirecting users to a country or language version based on IP address or browser settings, a pattern Google warns can prevent crawling of other versions.
In full
Because Googlebot crawls predominantly from US IP addresses, aggressive IP redirection can leave every non-US version undiscovered. Google's guidance is to avoid automatic redirection or, if used, to make it non-blocking and to provide clearly linked alternatives such as a banner or country selector. Redirecting based on `Accept-Language` has the same risk and additionally frustrates users whose browser language differs from their preference.
Example
A site replaces a hard IP redirect with a dismissible banner suggesting the local version, and its non-US pages begin indexing.
Related terms
hreflang x-default
The hreflang value marking the fallback page for users whose language or region does not match any specified alternate.
Geo-targeting
Signalling which country a site or section is intended for, through ccTLD choice, hreflang region codes, server location, local links and…
International SEO
Structuring and optimising a site so the right language and country version is served to the right audience in each market's search results.
302 redirect
A temporary redirect indicating the resource lives elsewhere for now; the original URL is expected to remain the canonical one.