An ISP is granted a block of classless address starting with 150.80.0.0/16. The

Question

An ISP is granted a block of classless address starting with 150.80.0.0/16. The ISP wants to distribute blocks of addresses to different customer groups as follows:

Customer Group 1: The number of customers in this group is 100. The type of customer is a medium-size business that needs 128 addresses.

Customer Group 2: The number of customers in this group is 200. The type of customer is a small-size business that needs 32 addresses.

Customer Group 3: The number of customer in this group is 1024. The type of customer is a household that needs 8 addresses.

Design the blocks (ranges) for each customer in slash notation. For a,b and c, only show blocks for the 1st, 2nd and last customer.

               d.) After a, b, and c are satisfied, how many addresses remain for the ISP?

Explanation / Answer

Customer Group 1:

For this each customer need 128 addresses.No of bits for this is 7 (27 =128) ie suffix length. prefix length is 32-7=25

Customer Group 2:

For this each customer need 32 addresses.No of bits for this is 5 (25=32) ie suffix. prefix length is 32-5=27

Customer Group 3:

For this each customer need 8 addresses.No of bits for this is 3 (23=8). prefix length is 32-3=29

No of unused address from the second last byte is= 255-106=149

Therefore total address remain with IP provider =149*256(last byte)=38144

First Address Last Address First Customer 150.80.0.0/25 150.80.0.127/25 Second Customer 150.80.0.128/25 150.80.0.255/25 Last Customer 150.80.49.128/25 150.80.49.255/25

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