[throw0101a]

> Enumeration of all IPv6 is impossible.

Though do take note of RFC 7707, "Network Reconnaissance in IPv6 Networks":

   IPv6 offers a much larger address space than that of its IPv4
   counterpart.  An IPv6 subnet of size /64 can (in theory) accommodate
   approximately 1.844 * 10^19 hosts, thus resulting in a much lower
   host density (#hosts/#addresses) than is typical in IPv4 networks,
   where a site typically has 65,000 or fewer unique addresses.  As a
   result, it is widely assumed that it would take a tremendous effort
   to perform address-scanning attacks against IPv6 networks; therefore,
   IPv6 address-scanning attacks have been considered unfeasible.  This
   document formally obsoletes RFC 5157, which first discussed this
   assumption, by providing further analysis on how traditional address-
   scanning techniques apply to IPv6 networks and exploring some
   additional techniques that can be employed for IPv6 network
   reconnaissance.

* https://datatracker.ietf.org/doc/html/rfc7707

[bombcar]

If we move to ipv6 majorly I suspect reflex scanning will become more of a thing (see a connection from X, scan X).