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Here I will show you a simple way of converting Binary to Hexadecimal, I will base this example on the first octet of an ip address.
Firsly I want you to understand that we need to break our 8 digit binary number up in to 2 sections. Each section is called a nibble. In this example we will be using 8 bit binary as you would see in an ip address.
Remember that with Hexadecmal once we count to the number "9" we then start on letters like so

• 1 2 3 4 5 6 7 8 9 A B C D E F

Lets use the Binary number 10001111 and convert it to Hexadecimal.
Binary number = 10001111
Break down in to 2 nibbles ( Groups of 4 ) from left to right 1000 1111
for the rest of this tutorial refer to my table below. You will see that I started with the first nibble which was "1000" I then took the last bit which is "0" and placed it in the colmn under number "1" I then took the 3rd bit which was "0" and placed it in the next column which is under number "2" I then took the 2nd bit of the nibble which is also "0" and I placed it in the next column to the left under number "4" I then took the 1st bit which is number "1" and placed it in the next column to the left under number "8"
I followed exactly the same procedure for the second nibble as you can see in the table below.
I then added all the 1s together for the 1st nibble as you can see in my table.

 128 64 32 16 8 4 2 1 Totals 1st Nibble 1 0 0 0 8+0+0+0=8 2nd Nibble 1 1 1 1 8+4+2+1=15

You will notice the second nibble totals 15 which is represented by the letter F

A = 10

B = 11

C = 12

D = 13

E = 14

F = 15 Answer = 8F

Binary To Decimal Conversion

Decimal To Binary

Cisco Help

Network Basics

Binary data (ASCII) American standard code for information interchange

1 = on

0 = off

This is the most standard code for representing alpha numeric data in a computer. ASCII uses binary digits to represent the symbols typed on a keyboard. When computers send on or off states over a network electrical lights or radio waves are used to represent one's or zero's. Each key pressed on a keyboard is represented by 8 binary digits.

So remember this computers use binary but people use decimal, binary is what we call base 2 because it only has 2 numbers. Decimal is base 10 because it has 10 numbers.