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Possible Duplicate:
How does Subnetting Work?

Is there a formula or a calculator for determining an IP address from CIDR that I was given: 38.103.17.160/27?

I would like to know the entire range of IP addresses from what I was given, but I have no idea how to break it down.

I am far, far from being a networking person so please go easy on me!

Community
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ONDEV
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3 Answers3

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http://www.subnet-calculator.com/ is awesome for those (like me) that don't like to do the math themselves.

Jason Berg
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Yes. That little number is supposed to give you that very information, but does require a bit of calculating. Have a look at this article which explains subnetting and how to calculate how many hosts/subnets that /27 refers to:

How does IPv4 Subnetting Work?

And once you know how it works, you can use some calculators to make work easier :)

  • http://www.subnetmask.info/
  • ipcalc - a tool in *nix systems
  • there are hundreds more with a simple Google search for 'subnet calculator'

EDIT: Jason mentioned my favourite one that I had forgotten about: A Way To Determine IP Range From CIDR?

Community
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uzzi09
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I generally use a tool called sipcalc (http://www.routemeister.net/projects/sipcalc/) to get a quick answer on subnetting questions, though you can also go through and do the binary math to figure it out.

madransom
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