Just like before you can't use the first and the last so you are in this case limited to 510 addresses. 9 binary bits translated to decimal gives you 512, so you can have 512 addresses for your devices ranging from 192.168.0.0 to 192.168.1.255. Now you have 9 bits for your devices (254 is 11111110). You change the network mask to 255.255.254.0. In real life you can't use the first and the last so you are in this case limited to 254 addresses. ![]() 8 binary bits gives you 256 decimal, so you can have 256 addresses for the devices on your network ranging from 192.168.0.0 to 192.168.0.255. It means that you decided to use the last 8 bits of the address for your devices. Suppose you choose for your network the address 192.168.0.0. The subnet mask only marks how many bits are fixed ( network part) and how many bits are variable ( device part) to use for your devices. On every IP device you have an adddress and a subnet mask. Who defines that division? The subnet mask.
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