Visual Subnet Tools

This repository is originally forked from https://github.com/davidc/subnets.

Additions and changes are detailed below.

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🆕 Visual Fn::Cidr tool (NEW)

https://kyhau.github.io/visual-subnet-tools/fncidr.html

This tool calculates and shows the potential outputs of the AWS CloudFormation’s intrinsic function Fn::Cidr (or !Cidr), which returns an array of CIDR address blocks.

This tool takes the same input as !Cidr [ ipBlock, count, cidrBits ].

See also this blog post https://blog.james.rcpt.to/2018/03/16/aws-vpcs-calculating-subnets-in-cloudformation/.

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🚀 Visual subnet calculator (modified version of davidc/subnets)

https://kyhau.github.io/visual-subnet-tools/subnets.html

Run with docker

cd <project folder>
docker build . -t subnets
docker run -d -p 5001:80 --name subnets subnets