Why these tools
Most online calculators send your input to a server and wrap it in ads. When the input is a customer's addressing plan, a production JWT or a firmware image, that is not acceptable. These pages are static files: the logic is plain JavaScript you can read with View Source, and it works offline once loaded.
Need more than a tool?
I design and deliver firewall migrations, HA clusters, centralized logging and secure remote access on Fortinet, plus Linux hardening and automation. Get in touch.