The Internet Engineering Task Force (IETF) has directed the Internet Assigned Numbers Authority (IANA) to reserve the following IPv4 address ranges for private networks:
24-bit block 10.0.0.0 – 10.255.255.255 Host ID size 24 bits Mask bits 8
20-bit block 172.16.0.0 – 172.31.255.255 Host ID size 20 bits Mask bits 12
16-bit block 192.168.0.0 – 192.168.255.255 Host ID size 16 bits Mask bits 16
The Internet Assigned Numbers Authority (IANA) has reserved the
following three blocks of the IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
https://datatracker.ietf.org/doc/html/rfc1918#section-3
Private Address Ranges
Class A: 10.0. 0.0 to 10.255. 255.255.
Class B: 172.16. 0.0 to 172.31. 255.255.
Class C: 192.168. 0.0 to 192.168. 255.255.
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