Doubts about subnetting

[rajthampi]

HI guys
I just started my program for CCNA certification and I found myself completely lost with the subnetting part. One of my major "concerns" are like this.
When I subnet 131.102.2.1/19 the first valid IP range I get is
131.102.32.1-131.102.63.254.
I am curious to know what happened to the range 131.102.2.1-131.102.31.254. Where does this IP range has gone? Is it possible that I can use this IP range at a practical scenario?

Thanks in advance for your answers
regards

[acox65807]

I hate to confuse you more, but actually with a /(slash)19 or 255.255.224.0
You actually end up with:
8 Subnets and 8190 Hosts
131.102.0.0
131.102.32.0
131.102.64.0
131.102.96.0
131.102.128.0
131.102.160.0
131.102.192.0
131.102.224.0

The Broadcasts are the ip just before the NEXT subnet (eg 131.102.31.255)
Make sense?

[Squashman]

This is one of the best resources for subnetting. I recently saw an article on the Internet the other day and it was about subnetting. This guy wrote this really cool diagram that explained it all. It was pretty cool, but I forgot to bookmark it.

http://www.learntosubnet.com/

[rajthampi]

Originally Posted by acox65807

I hate to confuse you more, but actually with a /(slash)19 or 255.255.224.0
You actually end up with:
8 Subnets and 8190 Hosts
131.102.0.0
131.102.32.0
131.102.64.0
131.102.96.0
131.102.128.0
131.102.160.0
131.102.192.0
131.102.224.0

The Broadcasts are the ip just before the NEXT subnet (eg 131.102.31.255)
Make sense?

First of all let me thank you for the post. Don't you think the first subnet is 131.102.32.0 rather than 131.102.0.0? I am using advance ip calculator program for cross checking my subnetting studies. I was curious to know about the first IP range 131.102.0.0-131.102.31.255 which wasn't present in the table of IP addresses calculated by the IP calculator program.

Let me thank you Squashman. The link provided by you is really useful.

Thanks and regards,
raj

[acox65807]

www.learntosubnet.com is probably the best starting point. Subnetting is probably the hardest thing to learn for most people. The key is to get a SOLID understanding of binary math. If you to the binary on the subnets I gave you, you will see your subnets/hosts. I will be glad to explain it in more detail later. Sitting at KC airport right now.

[acox65807]

use solar winds free advanced subnet calculator. I try to subnet in my head and can most of the time, but it's nice to verify your work. When I enter 131.102.2.1/19, it comes back with exactly what I gave you above.
131.102.32.0 is just 1 of the subnets you can use. But it is only 1 of 8.
www.solarwinds.net

[rajthampi]

Originally Posted by acox65807

use solar winds free advanced subnet calculator. I try to subnet in my head and can most of the time, but it's nice to verify your work. When I enter 131.102.2.1/19, it comes back with exactly what I gave you above.
131.102.32.0 is just 1 of the subnets you can use. But it is only 1 of 8.
www.solarwinds.net

I am sorry for replying this message so late. Yes I did download solarwind subnet calculator and as you mentioned with your earlier posts, it only added more confusion lol. Anyway I am more comfortable with subnetting now. Thanks for your help acox.
regards