History of Private Address Space?

Question

Computer networks

According to RFC 1918

The Internet Assigned Numbers Authority (IANA) has reserved the<br/>
 following three blocks of the IP address space for private internets:<br/>
<br/>
10.0.0.0 - 10.255.255.255 (10/8 prefix)<br/>
 172.16.0.0 - 172.31.255.255 (172.16/12 prefix)<br/>
 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)

But why were these ranges chosen?
After all, they are not in order, not from the beginning of the address space, and are not round numbers.

Answer 1

Initially, the networks were divided into classes ABC and began to be sorted starting from A as the largest. The tenth went to ARPANET, the progenitor of the Internet. Later it was cut down, and the addresses were given to private.
At the same time, we thought about allocated private addresses, since it is convenient to work with blocks, then they issued the first free aligned blocks of 16 and 256 networks of classes B and C. These networks turned out to be such.

Answer 2

comrades sat down, grunted a beer, ate chips and came up with. Well, I think that there was some kind of intent or cabbalistics.