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IPv4 addresses are limited. So we need to reuse them.
Different companies can use the same private networks and different public IP addresses.
Private addresses | Mask | Networks / Clients | |||
10.0.0.0 /8 | - | 10.255.255.255 | Class A | 255.0.0.0 | 1 network, 16.777.216 addresses |
172.16.0.0 /16 | - | 172.31.255.255 | Class B | 255.255.0.0 | 16 networks, 65536 addresses |
192.168.0.0 /24 | - | 192.168.255.255 | Class C | 255.255.255.0 | 256 networks, 256 adresses |
169.254.0.0/16 | - | 169.254.255.255 | Apipa/ Linklocal | ||
127.0.0.0/8 | - | 127.255.255.255 | Loopback |
For public Subnets (Internet) see this complete list.
Further Information
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