IP Subnetting and Supernetting

In the case I have and   the request is about adding 10 subnets ,will the new mask be : or ?

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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
That is correct.  You will have 16 subnets with each subnet accomodating 14 hosts.
Russ SuterSenior Software DeveloperCommented:
Here's a handy resource for figuring that sort of thing out. I use it all the time because I'm far too lazy to do binary math in my head.

You will have 16 subnets with each subnet accomodating 14 hosts.
Ain't necessarily so, that depends on user's needs - it is just said 10 subnets.
You should ask number of hosts per subnet since there can be a lot of combinations.
For example : you can also have 8 networks with 14 clients, and 2 networks with 30 clients. Or any other valid combination.

If you don't get more specific information go with /28 mask for all 10 subnets.
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jskfanAuthor Commented:
Predrag Jovic

I thought with 10 subnets, you can get 254 hosts by subnet .
Correct ?
Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
This is a C class address where each C class is 254 hosts.  When you divide this to smaller subnets, obviously each subnet will have less hosts.  Now if you were using a B class address then you would start with 65534 hosts and then sub-divide that to additional networks.  If you broke this down to 16 subnets then you would end up with each subnet having 4094 hosts.  As an example, = 4094 hosts, would give following:
You can have 254 host per network, but not if you create subnets from network, you can't divide it and still have 254 hosts per subnet.
You can create - networks and have 10 subnets, but...
Be careful where network start and where networks end.
I like create networks that can easily be summarized.

If you want you can use any private range.
I always prefer A or B class networks for bussines.
If networks need to have 254 hosts per subnet, I guess I would go with some range like (depending on  already existing networks)

As Mohammed already wrote summary would be (he had typing by mistake 172.116. :) )
and it would cover - networks

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jskfanAuthor Commented:
I do not us subnetting often
where I get confused is where to add the bits when it come to subnetting and supernetting

ex: ...if the request says add 20 subnets , then the closest is 2^5, which means you add 5 bits from the left
it will become =

I guess supernetting (reducing subnets in order to add more hosts) is not very common
jskfanAuthor Commented:
I will come back to this at later time
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