> IPv4 is also too small for private networks. Corporate networks are often full of hideous hacks like multiple NATs that negotiate interoperability between net

> IPv4 is also too small for private networks. Corporate networks are often full of hideous hacks like multiple NATs that negotiate interoperability between networks with overlapping 10.x address spaces, "theft" of unused IPv4 space such as US DoD addresses, etc. IPv4 is perfectly adequate as long as you're the only one using the e. g. 10.0.0.0/8 range. I don't think that overlapping private networks were ever designed into the use case.