Tom Beecher wrote:
6.1.3 <https://datatracker.ietf.org/doc/html/rfc7454#section-6.1.3>.at the time of writing of this document, IPv4 prefixes longer than /24 and IPv6 prefixes longer than /48 are generally neither announced nor accepted in the Internet
That's why, unlike IPv4, IPv6 is hopeless as rfc2374
was abandoned.
Masataka Ohta
