[dns-operations] An simple observation

[Davey Song]

Hi everyone, I‘m recently doing a little survey on the penetration of IPv6
in DNS system and it's latent problems.

I find that top websites like Google, Wikipedia,Yahoo already support IPv6
access, but its name servers are still IPv4-only. I'm wondering why? is
there any operation consideration or risk in their IPv6 deployment?

Best Regards,
Davey
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