Utilities
Tools
A small set of tools built from the kind of work an IT Systems Operations Engineer does every day — checking connectivity, working out subnets, generating credentials safely. Everything here either runs entirely in your own browser, or reads information Cloudflare’s network already sees for every request it handles — nothing on this page is stored, logged, or sent anywhere beyond what’s needed to render the result to you.
CIDR Calculator
Calculate a subnet's network address, broadcast address, mask, and usable host range — plus quick-reference tables for private, reserved, and special IP ranges.
Connection & Browser Check
See exactly what your connection and browser expose to this site — IP, approximate location, network, TLS, and a live WebRTC/fingerprint leak test.
Domain Lookup
Look up a domain's DNS records and registration details in one place — A/AAAA/MX/NS/TXT/CAA records plus registrar, creation, and expiration dates.
My IP
Your current public IP address — in the browser or from the terminal with a single curl command.
Password Generator
Generate a cryptographically random password entirely in your browser — nothing is sent anywhere, ever.