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carl_townshend
Frequent Contributor

subnetting again

How do I find out how many networks I can have in a particlular vlsm's , i.e

255.255.248.0, how do i work out how many networks I can have in this, also how come they addresses always go up on even numbers ?

7 REPLIES 7
saimbt
Beginner

u will have 8 subnets and a total of 2046 hosts.

I think you will have 1 subnet with 2046 hosts.

johansens
Enthusiast

Have a look at a tutorial for subnetting...

Here's one I found via google:

http://itic.durhamc.on.ca/kyrytows/subnetting/subnetting.htm

Did it help?

There is also a free IP subnet calculator that you can download from the Boson web site. It can help you understand how it all works.

http://www.boson.com/FreeUtilities.html

Hope this helps,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

The number of subnets depend on what class of address you're using.

Variable length subnet masking does not depend upon classfull addressing, therfore there is only one network.

Regards Mark.

balajitvk
Enthusiast

The no. of networks depends not only on subnet mask but also with the network id u have.

For exampls if u have class A 10.0.0.0 255.255248.0

it will give u 8192 subnets and 2048 host per subnet.

if u have class B 172.168.0.0 255.255.248.0

the same subnet mask will yield u only 32 subnets of 2048 hosts.

u can make u of subnet calculators to calculate no. of nodes and subnets

like,

http://www.subnetmask.info/

Hope this clarifies ur first doubt.

What u mean by even numbers ?????