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Understanding IPv4 and IPv6 Addresses

Learn the differences between IPv4 and IPv6 addresses. IPv4 consists of four bytes (32 bits) while IPv6 addresses are 16 bytes (128 bits) long. Understand how each address type is structured and the vast number of unique addresses they can accommodate.

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Understanding IPv4 and IPv6 Addresses

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  1. Web runing out of addreses • http://online.wsj.com/article/SB10001424052748704254304576116401267588510.html

  2. IPv4 • An IPv4 address consists of four bytes (32 bits). These bytes are also known as octets. • Ex: 234.5.67.190.086 • Each sub area can vary from 000 to 255 (2power8 = 256) • --- . --- . --- . --- • 0.0.0.0 through 255.255.255.255 • total of 32 bits • 2 power32 4 billion addresses

  3. IPv6 • IPv6 addresses are 16 bytes (128 bits) long • 2 power 128 unique addresses • Typically written as: • hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh • each byte in turns is represented as a pair of hexadecimal numbers, like in the following example: • E3D7:0000:0000:0000:51F4:9BC8:C0A8:6420 hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh

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