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# subnetting question

Posted on 2013-11-30

I have a practice lab where its asking me to take an IP address and find the ranges for it with the required number of hosts.

200.1.1.0 (Class C) and requires 40 hosts. I only know the long way to do this but my answer keeps coming out different than answer from the lab.

Lab Answer:

200.1.1.0, break into networks of 40 hosts each

40 hosts = 00101000 (6 bits) Subnet Mask = 255.255.255.192 Increment = 64

Ranges:

200.1.1.0 – 200.1.1.63

200.1.1.64 – 200.1.1.127

200.1.1.128 – 200.1.1.191

200.1.1.192 – 200.1.1.255

My answer (I hope you know the long way):

200.1.1.0, break into networks of 40 hosts each

40 hosts = 00101000 (6 bits)

255.255.255.0 = 11111111.11111111.11111111.00000000

255.255.255.252 = 11111111.11111111.11111111.11111100

(6 bits=252)

Since the last bit used in the last octet above converted from binary is 4, I add the 4th octet in increments of 4 for the results below. Where is my math wrong?

Ranges:

200.1.1.0 - 200.1.1.3

200.1.1.4 - 200.1.1.7

200.1.1.8 - 200.1.1.11

Thanks.