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IPv4 addresses are limited. So we need to reuse them.

First three subnets are reserved for private networks.

Different companies can use the same private networks and different public IP addresses.

Private addresses

MaskNetworks / Clients /8


Class A

1 network, 16.777.216 addresses /16


Class B

16 networks, 65536 addresses /24


Class C

256 networks, 256 adresses


Apipa/ Linklocal



For public Subnets (Internet) see this complete list.