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Classful Vs Classless IP addressing

auos

Hi,
I am very confused about classfull and classless IP addressing, can any one explained to me.
BR,
Auos

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Comments

mikej412

Try these links and see if they help....

http://www.techexams.net/forums/ccna-ccent/15774-clasful-classless-network-definition.html

http://www.techexams.net/forums/ccna-ccent/40953-please-help-me-vlsm-subnetting-cisco-router.html

http://www.techexams.net/forums/ccna-ccent/16505-classful-routing.html

http://www.techexams.net/forums/ccna-ccent/24357-classless-classful-routing-headachs-super-confused.html

tech-airman

auos wrote: »

Hi,
I am very confused about classfull and classless IP addressing, can any one explained to me.
BR,
Auos

auos,

What are you confused about?

auos

tech-airman wrote: »

auos,

What are you confused about?

I confuse as below:

If I have IP address
192.168.1.1 / 26 or
172.16.1.3 / 18

did this is classful or classless.

colebert

auos wrote: »

I confuse as below:

If I have IP address
192.168.1.1 / 26 or
172.16.1.3 / 18

did this is classful or classless.

192.*.*.* addresses are Class C
172.*.*.* addresses are Class B

Class C addresses are /24
Class B addresses are /16

But your class C address above is /26 so it is classless
But your class B address aboive is /18 so it is classless