If several things that could have gone wrong have not gone wrong, it would have been ultimately benifical for them to have gone wrong when you didnt want them to.
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Subnet Calculator
Subnet Calculator
What is a Subnet
Calculator good for? Well for 99% of Internet users it is of no importance.
So if you don't know what a subnet is this is probably not the Calculator
for you.
A Internet
address is a set of numbers like 192.168.0.1. A Internet address is actually
a 32bit Integer. The address is divided into two parts, the network number
and the host number. The net mask is used to show the Network number.
In the old days there where only three net masks 255.0.0.0 255.255.0.0
and 255.255.255.0 for A,B and C class networks. With the increasing number
of hosts on the Internet a more effective scheme is used called Classless
Inter-Domain Routing (CIDR). With CIDR you decide how many bits are being
used for the network part. A old Class C address (255.255.255.0) is in
CIDR notation /24 (i.e. the first 24 bits of the address is used for the
network number)
The Subnet
calculator start of with mask /25. If you are using 25 bits, your subnet
mask is (check the lower part of the tool) 255.255.255.128, you can divide
a old Class C network into two parts. Now slide the network address slider
past 127, you will see that the Network Address changed from 192.168.0.0
to 192.168.0.128. You can also see that the broadcast address changed.
If you want to make a list of all possible CIDR networks from the chosen
mask/address press the Generate subnet list.
Hopefully
this will give you an idea of how sub netting works
Tools 
