Subnet Mask Table

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There should be enough of them in each subnet. For example, if you need 10 devices, you will need at least 12 addresses (two additional for the network and broadcast address).

3. Select the appropriate subnet mask

For example, if you need to connect 50 devices, you malaysia telegram data can choose the /26 mask ( 255.255.255.192 ), which provides 62 addresses. If you need to connect 200 devices, then the /24 mask ( 255.255.255.0 ) will do - it has 256 available addresses.


Subnet mask table. Source
You should also consider the possibilities for network expansion. It is always better to choose a mask with a "reserve" to avoid problems in the future.

Subnet masks in IPv6
The old IPv4 model has a limited number of addresses. That's why the new IPv6 protocol is now used. Addresses are written in hexadecimal code using letters (AF) and numbers (0-9).

200185a3:0000:0000:0000:0000:0000/64

The IPv6 protocol uses classless CIDR addressing. The number of bits that indicate the network number is indicated by a prefix.

200185a3:…:/64

The example above uses the /64 prefix, so the first 64 bits of the address represent the network number.