Shulou(Shulou.com)06/01 Report--

I'm looking at the subnet mask calculator today. My math has always been a hard wound, and my brain is not very flexible.

But it turns out. IP decimal calculation. I didn't understand it at that time. What the heck is decimal calculation.

Take Baidu as an example. (because the address resolved after the domain name ping of our 51cto cannot be accessed directly. Awkward)

Whether it's www.baidu.com,

Or 61.135.169.121?

The result after the interview is the same.

But there is another way to visit.

Whether it's http://1032300921,

Or 1032300921?

The result is the same.

So here comes the question. How did this number come from?

The calculation process is as follows.

Divide dots into decimal

61.135.169.121

Convert to a decimal number

612562562561352562561692561211032300921

1023410176 + 8847360 + 43264 + 121 + 1032300921

Knowledge point: another representation of IP addresses converts 32-bit binary IP addresses into decimal integers

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