IPv6 Addresses

• 128-bit long. Fixed size

• 2128 = 3.4×1038 addresses ? 665×1021 addresses per sq. m of earth surface

• If assigned at the rate of 106/?s, it would take 20 years

• Expected to support 8×1017 to 2×1033 addresses8×1017 ? 1,564 address per sq. m

• Allows multiple interfaces per host.

• Allows multiple addresses per interface

• Allows unicast, multicast, anycast

• Allows provider based, site-local, link-local

• 85% of the space is unassigned

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