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Class C Subnetting ??

By k4k ·
According to my understanding the Subnet Mask
of class C 255.255.255.224 can have 6 Subnets those are 32,64,96,128,160,192. & it can have 30 host per subnet. i.e 11100000 three bits for Subnet & rest of the 5 bits for Host.

but you see there is an IP Address 203.200.55.55 with Subnet mask 255.255.255.224. how is this ??
here the subnet 55 is the point of confusion. according to what i understand the subnet 55 is not one of those i mentioned above. the above calculation says the subnets u can have for this subnet mask 255.255.255.224 are 32,64,96,128,160,192 then where did this 55 came from ??


Could u throw some light on this ??

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Class C Subnetting ??

by ins413 In reply to Class C Subnetting ??

With an IP of 203.200.55.x using 255.255.255.254 the list of possibilities is:

203.200.55.33 thru 203.200.55.62 (your address fits here)
203.200.55.65 thru 203.200.55.94
203.200.55.97 thru 203.200.55.126
203.200.55.129 thru 203.200.55.158
203.200.55.161 thru 203.200.55.190
203.200.55.193 thru 203.200.55.222

As you see, your address fits into the first possible range of addresses, which are all local to each other. 32, 64, 96... are just the network id portion of you address. With aClass B subnet (255.255.254.0) using 160.10.x.x, you would have

160.10.32.1 thru 160.10.63.254
160.10.64.1 thru 160.10.95.254

Just because 160.10.32.100 is different from 160.10.55.254, it does not mean that they are not included within the same subnet.

I hope that this did not confuse you. If anyone knows how confusing subnetting can be, it would be me.

Norm

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Class C Subnetting ??

by k4k In reply to Class C Subnetting ??

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Class C Subnetting ??

by wcquan In reply to Class C Subnetting ??

Do not confuse the subnet address with the addresses of hosts. As you said, the first subnet would be 32 (binary 0010 0000). Host addresses start with the next number (0010 0001) and would continue upto 62 (0011 1110). [63 (0011 1111) is used forbroadcasting on this subnet]

The next subnet, 64 would have hosts addresses of 65 thru 94. And so forth.

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Class C Subnetting ??

by k4k In reply to Class C Subnetting ??

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Class C Subnetting ??

by k4k In reply to Class C Subnetting ??

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