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If one has a class B IP address such as the Network ID 130.200.0.0 require more than one network ID, then he must apply to Internic to get a new IP address. But inventories at the current IP address is very limited because of the mushrooming number of websites on the internet. To overcome these difficulties and avoid you to have to submit a new request to Internic, revealing a technique to reproduce the network ID of a network ID that already exists. This is called subnetting, where the used host ID sacrificed for use in making additional network ID.
Explanation and completion of the process of subnetworks ;
IP address 130 .200 .0 .0
10000010.11001000.0000000.0000000 (bit) By default subnet mask 255.255.0.0

Now you want to have 2 network ID from the IP address that you currently have. For that you mask the top 2 bits from the host ID. By covering (mask) 2 bits from the host ID, then you have 4 combinations; 00,01,10,11 which can be used for the subnet. But 00 and 11 can not be used because all 0 or all 1 are not allowed in the regulations IP address. Therefore, only two combinations of 01 and 10 are known to be used for the subnet

Applies to the default subnet mask that was originally 255.255.0.0
1111111.1111111.0000000.0000000 (bits)

So after the mask a (modified into 1111111.1111111.11000000.0000000 (where the top 2 bits in the host ID on his mask to become part of the initial network ID number 16 now to 18 so that the new subnet mask becomes 255.255.192.0

From the above calculation process then you get 2 subnets with a subnet mask of the new
10000010.11001000.01XXXXXX.XXXXXX and 10000010.11001000.10XXXXXX.XXXXXXXX (where X is the number 0 or 1)

With the new subnet mask 11111111.11111111.11000000.00000000 or 255.255.192.0
So the first group (subnet 1) is read more... and see on page TCP / IP (Transmission Control Protocol / Internet Protocol)

keynote : TCP / IP (Transmission Control Protocol / Internet Protocol) , class