Hi Andrew From: https://tools.ietf.org/html/draft-sullivan-dns-class-useless-01
> Some RRTYPEs are defined in a class-dependent way. For instance, the > A record (type 1) is defined in [RFC1035] to be for class IN only. > Perhaps unfortunately, the IANA registry for RRTYPEs (at > <http://www.iana.org/assignments/dns-parameters/dns- > parameters.xml#dns-parameters-4>) does not include an indicator for > the class in which the RRTYPE is defined. Added to that, the "A" record type is also found in some places with RR TYPE=1, with the same name "A" for the CH class, where it has a completely different RDATA format and meaning. It isn't listed on the DNS parameters page, but it is implemented so by BIND and you can find a description here: http://victor.se/bjorn/its/chaos-dns.php Mukund
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