Subdividing IP Classes

• When an organization subnets its network number, the outside world does not see it; only the internal structure of the organization’s network will change. Reasons for subnetting include:

  • Match the physical layout of the organization
  • Match the administrative structure of the organization
  • Plan for future growth
  • Reduce network traffic

• The next slide illustrates the effect subnetting has on the Class B address 190.45.0.0. By masking the third octet, the administrator can create 254 different subnetworks, each of which can contain 254 hosts.

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