A Look into the Addresses of the ISP

• ISP is allocated a block of addresses: 209.16.0.0/16.

  • It must now find an efficient break up of the address

ISP segments off16 addresses of

the original address

209.16.0.0/16becomes

209.16.16.0/20

11010001.00010000.00000000.00000000

11010001.00010000.0001 | 0000.00000000

ISP splits this new

address in half,

yielding two address ranges

209.16.16.0/21

209.16.24.0/21

11010001.00010000.00010 | 000.00000000

11010001.00010000.00011 | 000.00000000

Based on a customer survey, 209.16.16.0/21 is given to a single customer

Yields 8 Class C addresses

209.16.24.0/21 is split up again

209.16.24.0/22 209.16.28.0/23

209.16.30.0/23

11010001.00010000.000110 | 00.0000000011010001.00010000.0001110 | 0.00000000

11010001.00010000.0001111 | 0.00000000

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