What is subnet mask should I use? If I currently use the default mask for myIP 192.168.1.0 I need to subnet my network so that I have 30 additional networks, and 4
How could you calculate subnetting of an IP address, and is it mandatory for a subnet mask to start only with an octet of 255.0.0.0? - Quora
![networking - Is there a subnet calculator that computes the *complement* of a subnet? - Stack Overflow networking - Is there a subnet calculator that computes the *complement* of a subnet? - Stack Overflow](https://i.stack.imgur.com/JmoyC.png)