I see some host providers offer cheap server but only support ipv6. I want to rent it, but I am still considering the SEO impact.
Can google and other search engine crawl and index it? If yes, will it have same qualification rank as ipv4?
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SEORoundTable.com quotes John Mueller of Google in 2017 as saying,
Google can handle sites on IPv6 & HTTP/2 all just fine with Google web search
, however he goes on to say you should still support IP4 and HTTP/1x. If you're not sure if you can use IP6 only, test with Google's Fetch or URL inspection.
They go on to quote Mueller as saying
If Googlebot can access it normally, and you're seeing a change in ranking, it's possible that the infrastructure change isn't related to the ranking change.
Unfortunately, they point to a server than has been redirected and appears to have lost John's original post so I can't point you to his original statement.