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:

  • A : – – used in big companies with lot of PCs (up to 16777216)
  • B : – – used in smaller companies (up to 1048576)
  • C : – – home and micro company usage (up to 65536)

Home routers usually come preprogrammed to 192.168.0.x or 192.168.1.x


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