Net Masks and the Subnet Calculator

Question

Net Masks and the Subnet Calculator

Hi,

Regarding the below chart,

Which is pulled from http://www.sustworks.com/site/prod_ipr_subnets.html

Network range would be 0-255

I understand that you need to subtract the IP address of network address and broadcast so I thought it would result to 253.

Although I was told that the correct answer is 254. The subtraction was made from 256-network address-broadcase=254 is what I was informed.

I'm not sure why it gets subtracted by 256? Can someone explain please?

Posted on Sep 1, 2015 2:18 PM

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Answer 1

BDAqua

Level 10

250,619 points

Sep 1, 2015 5:48 PM in response to oreoreoreore12

Hi,

Because 1 to 255 would be 255 numbers, add zero or start counting from zero & we get 256 numbers to chose from in on Byte/8 bits. 🙂

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Answer 2

Sep 2, 2015 5:45 AM in response to oreoreoreore12

Not entirely sure what you are asking, but each of the four number in an IP address is in the range 0-255 and there are exactly 256 different numbers between 0 and 255.

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Answer 3

Sep 2, 2015 1:53 PM in response to oreoreoreore12

Thanks for your answers. 0-255 = 256 is including 0... I thought 0 would not count. Thanks I can sleep well now

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