One of the subnets (blocks of IPv4 addresses) reserved for private networks by the Internet Assigned Numbers Authority (IANA) is 0.0/12.
The first address in this range is 172.16.0.0. The prefix length of 12 determines its size, meaning that all addresses in this subnet must share the same first 12 bits. that the "172" and "192" address ranges are only partially reserved for private usage. The remaining addresses are routable on the worldwide Internet since they are regarded as "public." A /21 is 255.255.248.0, which indicates that the third octet has a block size of 8, so we just count by 8 until we reach 66.
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