One report: expiry, certificate, DNS, email authentication and reputation.
Geolocation, ISP and network details for any IP address.
Registration and ownership details for a domain.
A, AAAA, MX, TXT and NS records for a domain.
Find the PTR hostname(s) for an IP address.
Check a DNS change against ten resolvers and probes on six continents.
Round-trip time and packet loss to a host, measured from six continents.
The hop-by-hop network path to a host, traced from six continents.
Whether a site is up, and how fast it answers, from six continents.
Validate the three DNS records that decide whether your email is trusted.
Build one valid SPF record for every service that sends your email, inside the 10-lookup limit.
Create a DMARC policy step by step and check your reports will actually arrive.
Grade a site's HSTS, CSP and other security headers, with the exact fix for each gap.
Trace every redirect hop, and check http, https and www all end in one place.
Limit which certificate authorities may issue SSL certificates for your domain.
What the common TCP and UDP ports are for, and whether each is safe to leave open.
Check an IP against six public DNS blocklists, including SpamCop and Barracuda.
Inspect a domain certificate: issuer, expiry, SAN, trust.
Domain registration date, age, expiry and registrar.
Live status and uptime history for monitored sites.
Network, broadcast, mask, host range and counts for a CIDR block.
Check common TCP ports on a host.
See if your browser leaks your real IP via WebRTC.
Your user-agent string and browser fingerprint.
Measure your download and upload speed.
MD5, SHA-1 and SHA-256/384/512 hashes of any text, in your browser.
Encode and decode Base64 and URL-encoded text, Unicode-safe.
Strong random passwords from your device's cryptographic RNG.
Format, validate and minify JSON, with line-and-column error reports.