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How to convert IP Subnetting

Computer Science
Tutor: None Selected Time limit: 1 Day

Convert network 147.128.0.0 ID in binary:


Apr 18th, 2015

IP Address of 147.128.0.0 in binary is  10010011.10000000.00000000.00000000

 If you want to do any calculation, you must first understand decimal conversion to binary. Every IP address consist of four octets and every octet in an IP address is represented by 8 bits.

octet1 octet2 octet3 octet4
-------------------------------------------------------------
  147   128           0      0

 
Now that you know that every IP has 4 octets, lets take a closer look at on of the octets, octet 1. This octet has a decimal value of 147 which would represent a binary value of 10010011. Every binary value consist of 8 bits, either 1 or 0. If a bit is 1 it is considered "active" or on, if it is 0 it is "not active" or off. But how does 147 make 10010011?

Simple, take a look at the standard binary calculation table below. You see 8 numbers, which represent the 8 bits in a binary value. Place the binary value 10010011 underneath and see what happens.

128 64 32 16 8 4 2 1
-------------------------------------------------------------
 1    0   0   1  0  0 1  1  -- Bits

Because every bit set to 1 is considered active, add the values corresponding with 1's.

128 + 16 + 2+ 1 =  147.


Another example:

The decimal value 128 would make a binary value of:

 
128 64 32 16 8 4 2 1
-------------------------------------------------------------
 1  0  0  0  0 0 0 0  -- Bits


128 = 128


If you would convert all four octets of the ip address 192.168.90.1 in to binary, it would look like this:


octet1  octet2  octet3  octet4
-------------------------------------------------------------
 147       128        0         0
-------------------------------------------------------------
10010011.10000000.00000000.00000000


Apr 18th, 2015

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Apr 18th, 2015
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Apr 18th, 2015
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