IP Subnetting

[Keith_Sparks_2000]

I'm a beginner when in comes to IP subnetting.

I have a class A ip address using 20.20.20.0. How do I go about subnetting this ip address???

[millerv]

its already subnetted. Its a Class A subnetted as a Class C. Unless you can change octets 2 & 3

[Keith_Sparks_2000]

What about subnetting an IP address using 164.111.117.0?

[millerv]

Same issue. You have a class B (164.111) used as a class C (164.111.117.0)

heres some references:

http://www.cisco.com/warp/public/701/8.html

http://www.cisco.com/warp/customer/701/3.html

http://www.cisco.com/techtools/ip_addr_help.html

[mmoscoso]

After you read all the info about subnetting you can use a very useful software like IP Subnet Calculator. To calculate your subnets and masks.

www.wildpackets.com

[fbreeze]

A very good resource for understanding subnetting can be found at www.learntosubnet.com

Great series of slides with an audio tutorial

Best regards... Frank

[bsivasub]

how about CISCO's sub-net calculator ;)

http://www.cisco.com/techtools/ip_addr.html

[nelson_koot]

You can download the IP calculator from www.download.com . Type in IP calculator and click search. You will have more understanding of how the subnetting go about.

[daniel.bowen]

Subnet calculators are very good but they do not teach you how to subnet an address space, and subnetting is a very good way of understanding exactly how IP works. I will mail you a document on how to subnet step by step that I wrote a few months back.

Daniel,

[daniel.bowen]

Keith, cannot seem to deliver this to your yahoo mail account (says it is over quota) can you supply another mail address?

Daniel,

[landon19792010]

Daniel,

Could you mail me a document on how to subnet step by step that you wrote.  I am taking a CCNA class and would like to learn this before starting.  My  email is landon79@hotmail.com

Thanks for your help

[Leo Laohoo]

IP Addressing and Subnetting for New Users
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800a67f5.shtml

IP Subnet Calculator
http://www.cisco.com/cgi-bin/Support/IpSubnet/home.pl

If my post is helpful in any way, please don't hesitate to rate.  Thank you very much.