IPv4 Subnet Calculator
https://ip4calculator.comIPv4 Subnet Calculator. This online IPv4 Calculator can be used to calculate subnet information based on an IP adress and a subnetmask. You can fill in an IP address and choose an subnet mask (by using the pulldown on the subnetmask field, or if you prefer the pulldown on the mask bit). When you know how many hosts you need within a subnet, you ...
VPC Subnet Builder
https://tidalmigrations.com/subnet-builderVPC Subnet Builder. The Tidal Migrations Subnet Builder takes the idea of an IP Calculator to the next level, allowing you to build entire cloud and datacenter IP address plans visually. Simply enter your highest-level parent subnet and start breaking it down by selecting subnets of the appropriate sizes using the buttons to the right.