Web
Inspect domains, headers and responses.
9 tools
Everything this page can read about your browser, screen and system — shown to you instead of collected.
Read the delivery path out of raw headers — who handed the message to whom, how long each hop took, and what the checks said.
Paste a response's headers and see which protections are missing — the ones that never show up as an error.
Expand an IPv6 address in full, or shorten it to the one canonical form — the two that have to match when you compare them.
Finds the http:// references that break an HTTPS page, and separates the ones browsers block outright from the ones they quietly upgrade.
Read a Set-Cookie header attribute by attribute, and see which protections are missing.
Turn a CIDR block into the numbers you actually need — network, broadcast, host range and usable count.
Break a URL into its scheme, host, path, query parameters and fragment.
Read a user agent string: browser, version, engine, operating system and device.