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IP Addressing

Posted on 2000-04-03
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I am taking Networking Essentials and having a hard time understanding IP addressing.  Help me understand the following question.

The IP address of one particular host within a company is 131.27.13.4.  The company is attached to the internet, with a Class B license.  They currently have 17 subnets, and expect to never have more than 60.  They require at least 1000 hosts on each subnet.

A.  Based on this information, what is the subnet mask?
I get 255.255.254

B.  What is the maximum number of hosts available on each subnet.

I get 1024

C.  For the host 131.217.13.4, list the range of addresses available on its subnet.

I get 256-152 = 4 (4*64 = 256)

Now am stuck.
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Question by:mad3654
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jlevie earned 100 total points
ID: 2682177
First you have to determine what the network is. If you look at it in binary terms and AND the netmask with the IP:

131. 27. 13.  4
255.255.254.000

It's obvious that the network that contains the IP is 131.27.12.0. From the netmask we know that there are 1024 possible IP's. Thus the range of valid IP's is:

131.27.12.1 - 131.27.13.254
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