IP Subnet Mask Quick Cheat Sheet ~ Ask The Admin

Wednesday, January 09, 2008

IP Subnet Mask Quick Cheat Sheet

So I get asked on a regular basis how many addresses can i get from a /24 subnet or what does 255.255.255.0 mean.

Let me break it down for you real quick like:

When you use 255.255.255.0 as your subnet you are limiting yourself to a network containing all the same ip's except for the last number. Like 192.168.1.0 where the 0 changes. And using 255.255.0.0 Would limit you to the last two digits changing like 192.168.0.0 . Are you with me? It gets a little more complex with different subnets but here is a quick breakdown for you:

Check out this IP Subnet Tool Calculator - MINT! http://www.syrex.co.za/ipcalc/

Comments (8)

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· 926 weeks ago

u r a lifesaver!

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· 902 weeks ago

<A HREF="http://aruljohn.com/ipcidr.pl" REL="nofollow">This IP/Cidr utility page has a better calculator.

Good tutorial ..... thanks.

deepak

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princess · 887 weeks ago

can someone be using my IP address to access the internet at his home?

1 reply · active 887 weeks ago

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Expert1 · 887 weeks ago

Are you talking about IP spoofing? Technically only one machine can use an IP at one time or there would be a conflict. Your address is also tied to your provider and location so it would be hard or impossible to do this.

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Jeff · 886 weeks ago

what does the /24 mean after an ip address

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AskTheAdmin 69p · 886 weeks ago

a whole subnet 256 addresses.

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