Connected: An Internet Encyclopedia
RFC 1035 - 3.3.10. NULL RDATA format (EXPERIMENTAL)
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3.3.10. NULL RDATA format (EXPERIMENTAL)

    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                  <anything>                   /
    /                                               /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

Anything at all may be in the RDATA field so long as it is 65535 octets or less.

NULL records cause no additional section processing. NULL RRs are not allowed in master files. NULLs are used as placeholders in some experimental extensions of the DNS.

Next: 3.3.11. NS RDATA format
Connected: An Internet Encyclopedia
RFC 1035 - 3.3.10. NULL RDATA format (EXPERIMENTAL)