•  dan   ( @dan@upvote.au ) 
      15•1 month ago

      From that RFC:

      0.0.0.0/8 - Addresses in this block refer to source hosts on "this"
network.  Address 0.0.0.0/32 may be used as a source address for this
host on this network; other addresses within 0.0.0.0/8 may be used to
refer to specified hosts on this network ([RFC1122], Section
3.2.1.3).

      (note that it only says “source address”)

      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:

    { ,  }

or
    { , ,  }

...

(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 it being a legacy IP for broadcasts - I don’t think that even works any more)