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DNS RR wire format Owner name (domain name) Encoded as sequence of labels Each label contains Length (1 byte) Name (n bytes [1..63]) ogud.com ? 04ogud03com00 Type : MX, A, AAAA, NS … CLASS: IN (other classes exist but not global) TTL: Time To Live in a cache RL: RD LENGTH: size of RDATA RDATA: The contents of the RR Binary blob, no TLV. +------------------+-----+------+--------+----+-----------+ + Domain name |type | class| TTL | RL | RDATA | +------------------+-----+------+--------+----+-----------+ |