Mailinglist Archive: opensuse-edu (132 mails)

["Grainge, Derek" <DGG@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

> What's 10.0.40.1/22 netmask?  How is this number (the 22) calculated?
> Can you use this style to indicate subnet mask 255.255.0.0, 
> for example?

22 means 22 bits.    Each of the 4 parts of the dotted quad number is a
byte, 8 bits, and /22 means 22 1's and the rest zeros

i.e. 22 1's = 8+8+6 1's =  11111111.11111111.11111100.00000000
 which is 255.255.252.0 if you do your binary conversions.

So 255.255.0.0  would be /16  and 255.255.255.0 would be /24 by the same
notation.  And this notation's a lot less brainfag.


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