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# On what basis are IP numbers assigned to PCs, and exactly what bears the number - the PC as a whole or some key component?

Question #57820. Asked by bloomsby. (Jun 19 05 1:46 PM)

gmackematix

According to the following a registry issues Internet Protocols in blocks of numbers as they are available to Internet Service Providers who allocate them to each internet user.
I don't know much about these things so someone please correct me if this is errant nonsense but I imagine they are stored on the processor.
I do know they are given in base 256 so the IP number 1.1.1.1 would be 1x256^3 + 1x256^2 + 1x256 + 1 = 16,843,009.
http://en.wikipedia.org/wiki/IP_number

 Jun 20 05, 8:22 AM
bloomsby

Many thanks. Allocation by ISP (rather than, say, a serial number stamped physically on the processor) sounds very sensible. A couple of years ago I had to replace the processor on my previous PC and, as far as I remember, my IP number remained the same.

 Jun 20 05, 1:37 PM

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 Take any positive whole number not greater than 50. If the number is even, divide it by two. If the number is odd, multiply it by 3, and add 1 to the result. Apply the same method to the resulting number, and continue in this way forming a chain of numbers untill you finally arrive at the number 1.Shown below is a chain of numbers that results from this method if you begin with 15: 15 - 46 - 23 - 70 - 35 - 106 - 53 - 160 - 80 - 40 - 20 - 10 - 5 - 16 - 8 - 4 - 2 - 1. As you can see, the number 15 requires 17 steps to end up at 1. Of the numbers not greater then 50, which takes the longest to reach the number 1?

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