Extending the Life of the IPv4 Address Space

• Original RFC for IP was RFC 760.

  • No concept of classes; address was 8-bit network ID

• RFC 791 introduced a segmentation of the address into Classes.

• RFC 950 introduced subnetting.

  • Allowed for efficiency to exist with Class addresses

• RFCs 1517–1520 introduced CIDR.

  • Used on the Internet routing tables

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