Section X: TCP/IP & IPv4

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Private IPv4 Addresses

source: https://en.wikipedia.org/wiki/Private_network

RFC 1918 name	IP address range	Number of addresses	Largest CIDR block (subnet mask)	Host ID size	Mask bits	Classful description
24-bit block	10.0.0.0 -- 10.255.255.255	16777216	10.0.0.0/8 (255.0.0.0)	24 bits	8 bits	single class A network
20-bit block	172.16.0.0 -- 172.31.255.255	1048576	172.16.0.0/12 (255.240.0.0)	20 bits	12 bits	16 contiguous class B networks
16-bit block	192.168.0.0 -- 192.168.255.255	65536	192.168.0.0/16 (255.255.0.0)	16 bits	16 bits	256 contiguous class C networks

In practice, it is common to subdivide these ranges into smaller subnets.

Dedicated space for carrier-grade NAT deployment

IP address range	Number of addresses	Largest CIDR block (subnet mask)	Host ID size	Mask bits
100.64.0.0 -- 100.127.255.255	4194304	100.64.0.0/10 (255.192.0.0)	22 bits	10 bits