93
Appendix B: IP Addresses from Decimal to Binary
Follow the example below to convert the IP addresses to binary numbers. Use the
calculator on the computer for conversion. The calculator can be found under this path:
Start> All Programs> Accessories> Calculator
. For Windows XP and Windows Vista,
click <View> on the calculator and click <Scientific>. For Windows 7 and Windows 8, click
<View> on the calculator and click <Programmer>. Then follow the steps in the following
example to convert the IP addresses.
The example below shows how to convert 192.168.2.81 to binary numbers.
Step 1:
On the left of the calculator, select <Dec>. Then enter the first decimal number of
the IP address,
“192”. Select <Bin> and the number will be converted to binary
number. Repeat the same procedure with the rest of decimal numbers. Remember
to select <Dec> before entering the next decimal number. Otherwise a decimal
number cannot be entered. The table below shows the binary number of each
decimal number.
Decimal Numbers
Binary Numbers
192
11000000
168
10101000
2
10
81
1010001
Step 2:
Each binary number should have eight digits. If a binary number does not have
eight digits, add a 0 in front of it until it does. The binary number of each decimal
number should be as follow.
Decimal Numbers
Binary Numbers
192
11000000
168
10101000
2
00000010
81
01010001
Step 3:
Therefore,
the
binary
numbers
of
IP
address
192.168.2.81
is
11000000.10101000.00000010.01010001.
