troubleshooting Question

How to manually calculate an IP range

Avatar of Catt999
Catt999Flag for Canada asked on
Networking Protocols
12 Comments1 Solution1339 ViewsLast Modified:
Hi Expets,

I am a newbie to networking (this is not an exageration!).  I have just taken the Network+ course and am now studying to write the certification exam.  And to boot, I do not currently work in a networking job (work in IT but not specifically innetworking).  So please be patient with me and try to understand if I ask what seems to be a stupid or obvious question.

Here goes...

I have the following scenerio that I am trying to work out in an effort to understand fully how subnetting works....

Address allocation provided by telco is 10.85.0.0 with a 12 bit mask.  What is the range of usable ip addreesses?

I have some of the basics figured out (I think).  Subnet mask is 255.240.0.0, network id is 10.80.0.0.  I used an online subnet calculator to get what the range is but I just cannot figure out how it arrived at the numbers

I believe it has something to do with the second octet of the subnet mask, where, from what I have read and studies, t4 bits were 'stolen' from the hosts.  Is this correct?  And if so, the next step I think has to do with using all possible on/off combinations for these 4 bits.  The prlblem I am running into is that I cannot figure out no way, no how, what on earth I do with this information to come out with the numbers that the calculator gave me!!!

Can some network expert please steer me in the direction I need to go?

Thanks in advance!

Connie
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