Whois straight from the registry, DNS records from our own validating resolver, a leak test that names the resolvers actually doing your DNS, a proxy check that says what your proxy tells the sites you use it against, ping with jitter rather than just an average, and a traceroute that names every router between us and the host. Each runs from our own address, not from your browser — and the three calculators run the other way round, entirely in your browser, because arithmetic has no business being a request.