Classful Notation

16,777,216

65,536

network

host

8

16

Class A

Class B

Class C

0.0.0.0 - 127.255.255.255

128.0.0.0 - 191.255.255.255

10

0

• Obsolete because of
  • depletion of B space
  • too many routes from C space

• Solution
  • Classless Inter Domain Routing
  • hierarchical address space allocation

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