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What does 192.168.1.1 /4 mean? Is there a calculator that translates this kind of notation to a list of IP addresses? For that matter any type of notation so that it would be easy and quick in the future.

Anybody can give a short answer so I wouldn't need to study the whole wiki page?

thanks

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That means that the 192.168.1.1 address is associated with a 240.0.0.0 mask.

You have to think binary to understand that. In binary your IP address would be: 11000000.10101000.00000001.00000001

In the same way /4 represent the number of "1" bits in the mask. So here the mask is 11110000.00000000.00000000.00000000 (which is 240.0.0.0 in decimal)

/8 would be 11111111.00000000.00000000.00000000

/24 would be 11111111.11111111.11111111.00000000 (this is a very commonly used mask)

So here :

1100 0000.10101000.00000001.00000001 (your IP)

1111 0000.00000000.00000000.00000000 (your mask)

That means that what is written in strong is a network, and what is written in emphasis is a sub-network. So every device with an IP starting with "1100" would be in the same local sub-network. But an IP starting with "1110" or anything different than "1100" will not be in the same sub-network, and will not be able to communicate directly with an IP starting with "1100".

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