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New Member

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
New Member

Re: subnetting again

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

New Member

Re: subnetting again

I think you will have 1 subnet with 2046 hosts.

Silver

Re: subnetting again

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?

Cisco Employee

Re: subnetting again

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
New Member

Re: subnetting again

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

New Member

Re: subnetting again

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

Regards Mark.

Silver

Re: subnetting again

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 ?????

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