About
cf-projects is a small dashboard of networking projects, built from hands-on practice. Today it holds two tools — a subnet calculator and Subnet Sketch, a planner that sizes subnets from device counts — and a growing set of guides. The aim is answers you can trust and can see the reasoning for.
Privacy
- The tools run entirely in your browser. What you type never leaves your device.
- No accounts, cookies, analytics or third-party requests. Even the fonts are served from this site.
- Examples use the documentation ranges
192.0.2.0/24,198.51.100.0/24and203.0.113.0/24(RFC 5737).
Correctness
The subnet math is covered by tests with known answers, including the edge cases: /31 point-to-point links (RFC 3021), /32 host routes and /0. Subnet Sketch reserves the network, broadcast and a gateway address in every subnet it plans.