IPv4 is controlled standard where IANA is one defining address ranges and assigns IP numbers to user (companies). IANA defines 3 private ranges used only on Intranet or private use, not used on Internet. Ranges are called classes A, B and C and they are: Home routers usually come preprogrammed to 192.168.0.x or 192.168.1.x Reference
How to Set IPv4 Address for Intranet
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