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Use whichever method is most logical to yourself

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Once again, many people have many different methods to speed up calculations

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Don't try and learn them all, just learn the ways that makes the most sense to you

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and that are easy to learn

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Now let's extend our discussion to IPv4 Addresses

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An IPv4 Address is used to uniquely identify a device in an IP Network

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IPv4 Addresses are 4 octets in lenght, in other words they are 4 grouping of 8 bits

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or 4x8, each octet is 8 bits in lenght in the range 0 to 255

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Juts imagine that a bit is a logical cable that can have current or not have current

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In other videos I'm gonna explain IP Addressing in a lot more detail as well as Subnetting

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but for now just understand that an IPv4 Address is 4 octets

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in other words 4x8 bits

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IPv4 Addresses can be represented in both binary and decimal format

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So here's an example 10.1.23.19 is the decimal representation of an IP Address

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in this case IPv4 that can be represented as follows in binary

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so 10 equates to 0000 followed by 1010

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0000000 followed by a 1 in binary is the equivalent of decimal 1

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00010111 is the binary equivalent of 23

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and 00010011 is the equivalent of 19

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This is kind of like saying tomato versus tomatoe or router versus router

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use whichever term you prefer, for networking however it's important that

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you know both decimal and binary

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So let's start with 10, 8+2= 10, in other words this bit is on and this bit is on

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the other bits are set off, 8+2= 10 and thus 00001010 is the equivalent of 10 in decimal

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8+2= 10 other bits are set off, only these 2 bits are on

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What about 129? 128+1= 129, this bit and this bit are set on

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and other bits are set off, thus 10000001 is equivalent to 129 in decimal

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using our language analogy, this is French and this is English

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different language but we are saying the same thing

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What about 16? So 16 = 16, this is an easy one

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this bit is the equivalent of 16, so that bit is set on and the other bits are set off

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so 00010000 in binary is equivalent to 16 in decimal

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and lastly 123, 64+32+16+8+2+1= 123, in other words the first bit is off

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second bit is on which =64, third bit is on which is 32, 4th bit is 16

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5th bit is 8, 7th bit is on which is 2 and last bit is 1

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so 64, 32, 16, 8, 2, 1 gives us a 123

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In other words 01111011 is the equivalent of a 123 in decimal

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So just to reiterate, remember 2 to the power of 0 equals 1 in decimal

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2 to the power of 1 equals 2 in decimal, 2 to the power of 3 equals 8 in decimal

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2 to the power of 4 is 16, 2 to the power of 5 is 32, 2 to the power of 6 is 64

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So 64+32+16+8+2+1= 123, so the most significant bit is set off

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the 2nd, 3rd, 4th, 5th bit is set on, the 6th bit is set off

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and the 7th and 8th bit is set on, that gives us this value in binary

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which is the equivalent of 123 in decimal

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I'm hoping that this shows you how to convert a decimal IP Address into binary