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convert his website to IPv6
I cant see any logical reason why ipv6 address would give a solid clue to Google about a site's quality but I guess its a similar story to the https debacle.
i thought that the existing IpV4 set of addresses will be a subset of the new IpV6 set, and will therefore automatically be treated as IpV6 addresses when the time comes.
IPv6 or IP version 6 is the next generation Internet protocol which will eventually replace the current protocol IPv4. IPv6 has a number of improvements and simplifications when compared to IPv4. The primary difference is that IPv6 uses 128-bit addresses as compared to the 32-bit addresses used with IPv4. Among other things, this improvement is expected to make assigning address to wireless devices easier and accommodate the myriad smart network enabled devices that will surround us in the future.
IPv6 and IPv4 will coexist on the Internet for quite a while. Currently some of the IPv6 Internet exists as tunnels over the existing IPv4 Internet.
(...) all the hosting companies I have spoken to say he would need a dedicated IP on a dedicated server (...)
What's the difference between a "AAAA" dns record and a non-AAAA?
# a couple of google's many A records
google.com. A 184.108.40.206
google.com. A 220.127.116.11
# 1 AAAA record for google.com (AAAA is the IPV6 version of an A record)
google.com. AAAA 2607:f8b0:4003:c07::65
# A CNAME record for mail.google.com (CNAME is an alias hostname)
mail.google.com. CNAME googlemail.l.google.com.
# 2 of 5 MX records (where mail to that domain should go) for google.com
google.com. MX 10 aspmx.l.google.com
google.com. MX 40 alt3.aspmx.l.google.com.