
July 10th, 2002, 10:43 PM
#1
IP address'
http://www.ralphb.net/IPSubnet/ipaddr.html
An IP (Internet Protocol) address is a unique identifier for a node or host connection on an IP network. An IP address is a 32 bit binary number usually represented as 4 decimal values, each representing 8 bits, in the range 0 to 255 (known as octets) separated by decimal points. This is known as "dotted decimal" notation.
Question: What the hell is a node?
140 .179 .220 .200
10001100.10110011.11011100.11001000
How was this conversion accomplised? What was the equation?
It is better to be HATED for who you are, than LOVED for who you are NOT.
THC/IP Version 4.2

July 10th, 2002, 10:51 PM
#2
A node is just 1 particular point on a network, or an ip address...
the difference between the numbers is a difference in base,, decimal is base 10, binary is base 2
so 140 == 1000 1100 binary
Quick and dirty :
think of it this way, what is 140 ? 140 means there is 1 100, 4 10's and 0 1's, each a multiple of 10, binary is no different, but the multiples are 2
so the places for an 8 bit binary number are 128 64 32 16 8 4 2 1, so 1000 1100 means 1 128, 1 8, 1 4, add those up: 128 + 8 + 4 = 140.
179 = 10110011 or one 128 + one 32 + one 16 + one 2 + one 1 = 179
You might also by the way see hex, which is based on multiples of 16, works the same way except there are digits for 1015 (a, b, c, d, e, f respectively), quick way from binary to hex is to take binary in groups of 4, so 179 would be 10110011 or b3.
Neb
There is only one constant, one universal, it is the only real truth: causality. Action. Reaction. Cause and effect...There is no escape from it, we are forever slaves to it. Our only hope, our only peace is to understand it, to understand the 'why'. 'Why' is what separates us from them, you from me. 'Why' is the only real social power, without it you are powerless.
(Merovingian  Matrix Reloaded)

July 10th, 2002, 10:54 PM
#3
For binary:
128  64  32  16  8  4  2 1

1  0  0  0  1 1  0 0 = 140.

July 10th, 2002, 10:57 PM
#4
1 node = 1 device. ie your computer is a node. If you have a plug and play microwave sitting on your network, it is 1 node. Any single endpoint is a node.
the conversion was chaning 140 to binary, 179 to binary, 220 to binary, and 200 to binary. There have been a couple tutorial written on it. Just search google for decimal to binary conversion. either that, or open up the calculator on a windows machine. Put it in scientific mode (View>Scientific) type in the number (140). Then click the radio button next to Bin (Binary). It wil give you the binary number, and requires no thought... Do that for each of the 4 numbers, and you will have you 32 bit number....
\"Ignorance is bliss....
but only for your enemy\"
 souleman

July 11th, 2002, 02:21 AM
#5
Dr. Toker. I see your question has been answered, is there another part to this question?

July 12th, 2002, 06:45 AM
#6
nebulus200 showed you the sum of weights method of decimal to binary conversion, I thought it might be helpful to show you a second way, called the division by two method.
This is simple, simply take your decimal number, divide by two, and write down your remander, then divide your answer by 2, write down the remainder, and so on till you can no longer divide by 2 without getting fractional numbers. Here is an example:
Convert 12 in decimal to a binary number equivalent
12/2 = 6 remainder 0
6/2 = 3 remainder 0
3/2 = 1 remainder 1
1/2 = 0 remainder 1
Now the first remainder you got is your LSB (least significant bit)
The last remainder you got is your MSB (most significant bit)
So you would write out the remainders like so:
1100 and that is the binary equivalent of your decimal number 12.
To convert from binary to decimal quickly my teacher showed me a trick, like folows:
1100
multiply the first bit by 2, 1 x 2 = 2 and add the next bit, 2 + 1 = 3, multiply the result by 2, 3 x 2 = 6, add the next bit which is 0, 6 + 0 = 6, multiply the result by 2, and add the next bit, 6 x 2 = 12 + 0 = 12. So basicaly you multiply the MSB by 2, add the next bit, multiply the answer by two and add the next bit, till you get to the end. Another example:
10010110
2 x 1 = 2 + 0 = 2 x 2 = 4 + 0 = 4 x 2 = 8 + 1 = 9 x 2 = 18 + 0 = 18 x 2 = 36 + 1 = 37 x 2 = 74 + 1 = 75 x 2 = 150 + 0 = 150 so the answer is 150.
In snatches, they learn something of the wisdom
which is of good, and more of the mere knowledge which is of evil. But must I know what must not come, for I shale become those of knowledgedome. Peace~

July 12th, 2002, 10:02 AM
#7
To elaborate on soulemans point. Its not just an end point that is a node. A node in networking is one devioce. This can be router switch hub etc etc. Anything really apart from wires!

July 12th, 2002, 02:53 PM
#8
Nebulus200: quick way from binary to hex is to take binary in groups of 4, so 179 would be 10110011 or b3.
I should have elaborated a little better: 10110011, split into groups of 4, so you have 1011 and 0011, then just convert like you normally would to decimal,
1011 binary = 11 decimal = b hex (a=10, b=11, c=12, d=13, e=14, f=15)
0011 binary = 3 decimal = 3 hex
concatinate your answer : 1011 0011 binary = b3 hex
Anyway, I can rest easier now that I actually explained what I meant, I tend to assume to much
Neb
There is only one constant, one universal, it is the only real truth: causality. Action. Reaction. Cause and effect...There is no escape from it, we are forever slaves to it. Our only hope, our only peace is to understand it, to understand the 'why'. 'Why' is what separates us from them, you from me. 'Why' is the only real social power, without it you are powerless.
(Merovingian  Matrix Reloaded)

July 19th, 2002, 01:03 AM
#9
Member
Yes, a node is actually any network ressource that uses TCP/IP with a IP adress.
IP adress are in a format of 4 bit in decimal 140.25.145.21. With a decimal value of 0 to 255 max described as the maximum value of a 8 bit binary number.
128  64  32  16  8  4  2  1

0 0 0 0 0 0 0 0 = 0
0 0 0 0 0 0 0 1 = 1
0 0 0 0 0 0 1 0 = 2
0 0 0 0 0 0 1 1 = 3
0 1 0 0 0 1 0 1 = 69 dude
and so on...
You could also complicate things by going into describing the differences between and IP Classes and Subnetting, a quite interesting concept to read !
See ya !

July 19th, 2002, 01:13 AM
#10
Junior Member
Sorry to just jump in, but I FINALLY get the basics of converting the IP address. I have often seen explanations on this, but they always just confused me more. Thank you all for the great group of explanations and examples!
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