IP Address Question


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Different subnets? Well, I wanted to know because on this page I went to, my friend was posting messages on a board and it showed his IP. Then someone else different posted and it had the same IP. Well, technically it wasn't the same because the last 3 digits of the IP are blocked while the rest were exactly the same. I was thinking, could it be the same? Could someone be imitating or copying IPs? I mean, besides the last 3 digits, what are the chances of 2 people on the same board having the other numbers of the IP identical? So this led me to believe there might be a program for duplicating IP addresses.

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The chances are high, a lot of people now are using cable internet and their IP address in the US will be similar. It could just be that the two people happen to use the same company to access the Internet.

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yes thats how cable operates, for my knowledge that is, the first 3 parts of the IP are the same, and the last part differs, that is why some anti-ISP likers who enjoy attacking the company, can easily randomize and hack anyone randomly, they just make up the last part up and try it, so its really an unsafe factor IMO, but since the inception of IPv6 is appearing, this risk issue should be eventually lowered

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As far as I understand, you can at least be almost certain the person had the same local internet provider.

Depending on how the provider handles dynamic IP's and the like and how often they turn over, it might simply be another on the same network who connected around the same time as your friend.

It's a small world. Coincidences happen. People with similar interests are more likely to overlap and bump into each other than not.

Very very doubtful (most would say impossible no matter what) that the IP's were exactly identical. Personally, I'm unaware as to how someone could forge an IP that's already in use.

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A easy explanation is that it's called a CIDR/24 or Classless Internet Domain Routing. CIDR means there are 256 IP addresses since the first three numbers would remain the same. A CIDR/23 would be two CIDR/24 so for example, one can have 1.2.3.x and 1.2.4.x. Each of the four numbers count from 0-255. Then someone can have a block that covers everything under the first 2 numbers.

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