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LV the fourth day of rampant and POPs up messages like "Oh my God, they block even subnet /10!"

What it means /10, /24, /n, ... ?
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/10 - the abbreviated writing of the mask.
Mask length can be from 0 to 32 bits.
The greater the length of the mask - the smaller the leaf nodes included in the network.
Accordingly, panicking all because of the fact that RCN is blocking a very large network indiscriminately (/10 - 4194304 Hosts).

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Here's the picture /23 example:

Excerpt from the same article:
...
/25 is 512
...
/10 is a 4 194 304 addresses

That is, when the lock /10 along with several addresses of the cart ILV blocked more than four MILLION "neighbors"
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The dimension is the total number of possible addresses. /10 is the number of non-changing bits. The address is 32 bits or 4 bytes to 4 numbers from 0 to 255. 24-bit, not changing, means that only changes 32-24=8 , which is equivalent to 255 addresses - 192.168.0.0/24 - it addresses 192.168.0.0 to 192.168.0.255 .
32 - 10 = 22 bits is 2^22 = 4194304 addresses (enough for some sort of average of the country)
the figure is very high - hence the outrage.
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