TYPE_A
TYPE_NS
TYPE_CNAME
TYPE_SOA
TYPE_PTR
TYPE_MX
TYPE_TXT
CLASS_IN
OPCODE_QUERY
OPCODE_IQUERY
OPCODE_STATUS
RCODE_OK
RCODE_FORMAT_ERROR
RCODE_SERVER_FAILURE
RCODE_NAME_ERROR
RCODE_NOT_IMPLEMENTED
RCODE_REFUSED
$data
$header
$questions
$answers
$authority
$additional
$consumed
__construct()
prepare()