DNS across resolvers

Ask four public resolvers the same question and see whether they agree. Useful for checking propagation after a record change.

Redirect chain

Follow a URL one hop at a time and see every status code, Location header and cache header on the way.

TLS versions and ciphers

Lists the TLS versions a server enables and every cipher suite it accepts, in the order it prefers them.

Takes 5–20 seconds. Sites served through Cloudflare can't be scanned yet.