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How does IPv4 Subnetting Work?

I see ip addresses with /4, /8, /12 and other multiples of 4. What does it mean? an example is seen here

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marked as duplicate by joeqwerty, mgorven, Zoredache, jscott, Chris S Nov 2 '12 at 23:02

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Why not follow the link in the article and find out: en.wikipedia.org/wiki/CIDR –  joeqwerty Nov 2 '12 at 22:57

1 Answer 1

It is the size of the network mask in bits.

So 255.255.255.0 = 11111111.11111111.11111111.0 or 24 bits, just count the 1's.

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