An IPv4 CIDR into its network address, netmask, broadcast, total and usable host counts and the first and last usable host, with the address as a 32-bit integer and back again.
Network
Result
Open Graph and Twitter cards with a live link preview and character counts.
Expand a crontab into its fields, plain English and the next real run times.
Read the live viewport, DPR and orientation, and see which CSS breakpoints are active.
Build a working Apache .htaccess with HTTPS + canonical redirects, caching, compression and security headers.
Search and replace across a whole text with regex or literal find, case and whole-word toggles, and capture groups.
Build initialisms, recursive acronyms and random words from a phrase, plus a back-expander.
Check a phrase or number as a palindrome with a character mirror map and the longest palindromic substring.
Paste a Content-Security-Policy header and get every directive split out with its source list and a verdict, plus findings for unsafe-inline beside a host allowlist, wildcard sources, a missing default-src, data: in script-src, http: next to https:, and nonces with no strict-dynamic.
