How to implement the use of IPv6 and its comparison with ipv4

With the shortage of IPv4, IPv6 is gradually being widely used. Comparison between IPv4 and IPv6:
1) Comparison of digits
ipv4: 4 segments, each segment is 8 binary bits, a total of 32 binary bits
ipv6: 8 segments, each segment is 4 hexadecimal digits, a total of 32 hexadecimal digits, 128 binary digits

2) Address classification comparison:
ipv4: 5 categories, A, B, C, D, E, the first addresses of each are:
A: 0-126
B: 128-191
C: 192-223
D: 224-239
E: 240-254

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