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Is a DNS allowed to reply with a different IP than the one stated at the records in the domain name registrar?

I am especially interested in the case where the DNS is provided by an ISP.

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Do you mean whether the in-zone A or AAAA record for a nameserver can be different from the glue record supplied by the delegating nameserver? –  Celada Apr 9 '13 at 16:03

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