which was based on RFC 1122, which states:

            We now summarize the important special cases for Class A, B,
            and C IP addresses, using the following notation for an IP
            address:

                { <Network-number>, <Host-number> }

            or
                { <Network-number>, <Subnet-number>, <Host-number> }

            and the notation "-1" for a field that contains all 1 bits.
            This notation is not intended to imply that the 1-bits in an
            address mask need be contiguous.
...
            (a)  { 0, 0 }

                 This host on this network.  MUST NOT be sent, except as
                 a source address as part of an initialization procedure
                 by which the host learns its own IP address.

                 See also Section 3.3.6 for a non-standard use of {0,0}.

(section 3.3.6 just talks about broadcasts)