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DHCP Scope

Posted on 2009-07-07
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can you tell me the DHCP scope, subnet mask by looking at something like 10.41.81.0/27?
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Question by:miriggall
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by:Ahmed Ezzat AbuRaya
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If you mean the valid IPs in the subnet.. (10.41.81.1 - 10.41.81.30)
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by:Ahmed Ezzat AbuRaya
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/27 is 255.255.255.224
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by:miriggall
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I accept both your answers, but how do you know this.
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/27 is a CIDR notation (Classless Inter-Domain Routing). You can read more about it here: http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing

*Basically* (/27) means you have 27 bits set as '1' in the subnet mask: (11111111.11111111.11111111.11100000) (all in binary) when converted to decimal you have (255.255.255.224)  (To convert binary to decimal: http://www.wikihow.com/Convert-from-Binary-to-Decimal)

You can play with (http://www.subnet-calculator.com/cidr.php) and read more about VLSM (variable length subnetting mask if you are interested. There are many tutorials about it (e.g. http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800a67f5.shtml)

For your network 10.41.81.0/27,  (/27 = block sizes of 32 users) so you have IP range of (10.41.81.0 to 10.41.81.31) .. First IP and last IP (10.41.81.0 & 10.41.81.31) are not valid IPs (e.g. You can't assign them to hosts) so you are left with valid IP range of (10.41.81.1 - 10.41.81.30).

There are just lots of details and I don't know how much deep you want to know :) The links I gave you provide more detailed information if  you are interested.

Hope this helps :)
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by:miriggall
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Excellent timely response.  thanks
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