Subnetting Chic B Addresses
Written on 11:33 by Ahmet Emir
Before we dive into this, let’s attending at all the accessible Chic B subnet masks first. Apprehension that
we accept a lot added accessible subnet masks than we do with a Chic C arrangement address:
255.255.0.0 (/16)
255.255.128.0 (/17) 255.255.255.0 (/24)
255.255.192.0 (/18) 255.255.255.128 (/25)
255.255.224.0 (/19) 255.255.255.192 (/26)
255.255.240.0 (/20) 255.255.255.224 (/27)
255.255.248.0 (/21) 255.255.255.240 (/28)
255.255.252.0 (/22) 255.255.255.248 (/29)
255.255.254.0 (/23) 255.255.255.252 (/30)
We apperceive the Chic B arrangement abode has 16 $.25 accessible for host addressing. This agency we
can use up to 14 $.25 for subnetting (because we accept to leave at atomic 2 $.25 for host addressing).
Using a /16 agency you are not subnetting with chic B, but it is a affectation you can use.
By the way, do you apprehension annihilation absorbing about that account of subnet values—
a pattern, maybe? Ah ha! That’s absolutely why I had you acquire the
binary-to-decimal numbers at the alpha of this section. Since subnet
mask $.25 alpha on the larboard and move to the appropriate and $.25 can’t be skipped, the
numbers are consistently the aforementioned behindhand of the chic of address. Memorize
this pattern.
The action of subnetting a Chic B arrangement is appealing abundant the aforementioned as it is for a Chic C,
except that you aloof accept added host $.25 and you alpha in the third octet.
Use the aforementioned subnet numbers for the third octet with Chic B that you acclimated for the fourth
octet with Chic C, but add a aught to the arrangement allocation and a 255 to the advertisement section
in the fourth octet. The afterward table shows you an archetype host ambit of two subnets used
in a Chic B 240 (/20) subnet mask:
Just add the accurate hosts amid the numbers, and you’re set!
The above-mentioned archetype is accurate alone until you get up to /24. After that, it’s
numerically absolutely like Chic C.
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