Member Avatar for drizzydrake

hi,
Ive been working on this problem where 'An organization is granted the block 16.0.0.0/8, the admin wants to create 500 fixed length subnets'
I'm having trouble with 'D' where i have to find the last address in subnet 500. Could someone explain how i could do this?
i am required to do the following questions: (i've already done till C)

a) Find the Subnet Mask = subnet mask is /17 since 9 bits are required for 512 subnet (8 + 9)
b) No. of addresses = 2^32-17 = 2^15 = 32768
c) Find the 1st and the last addresses in subnet 1 = 1st Address 16.0.0.0, last address 16.0.127.255 (i did these using ANDing and ORing)
d) find the first and the last addresses in subnet 500

ps. the answers for D are: 1st : 16.249.128.0, last: 16.249.255.255 (i just need to know how to get there)

thanks

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  • Latest Post Latest Post by scudzilla
Member Avatar for scudzilla

Well, if the first subnet starts at 16.0.0.0, and it ends at 16.0.127.255, then it means the second subnet starts at 16.0.128.0. Then you get the pattern: for every subnet, add 128 to the third octet. You can add manually until the 500th subnet, or come up with a formula for that.

Edited by scudzilla
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