![]() ![]() The list is terminated by either a single null-byte representing the "root" of the DNS, or by a byte with the two high-order bits set (value 192) to signal an indirect pointer to another location in the message. Each label represents one of the dot-separated substrings in a fully qualified domain name (FQDN). "IN" for the Internet and IP networksĪs in unicast DNS, the QNAME field consists of a series of length/value sub-fields called "labels". the type of RR which should be returned in responses.īoolean flag indicating whether a unicast-response is desiredĬlass code, 1 a.k.a. Name of the node to which the query pertains ![]() The wire format for records in the query section is slightly modified from that in unicast DNS, adding the single-bit UNICAST-RESPONSE field. The number of records in each sub-section matches the value of the corresponding *COUNT field in the header. The header is identical to that found in unicast DNS, as are the sub-sections in the data part: queries, answers, authoritative-nameservers, and additional records. The payload structure is based on the unicast DNS packet format, consisting of two parts-the header and the data.
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