All Tools
Each tool runs server-side, returns results in under a second, and works on any domain, not just sites hosted with us.
SSL Certificate Checker
Inspect any HTTPS site's SSL certificate. See expiry, issuer, certificate chain, supported domains (SANs), and whether the cert is currently valid.
Expiry date and days remaining
Issuer and certificate chain
Subject Alternative Names (SANs)
Validity status (valid / expiring soon / expired)
Open SSL Checker
DNS Lookup & Propagation
Query A, AAAA, MX, TXT, CNAME, and NS records. We check four major public resolvers (Cloudflare, Google, Quad9, OpenDNS) so you can see if DNS changes have propagated.
A, AAAA, MX, TXT, CNAME, NS records
Propagation across 4 public resolvers
TTL values for each record
Clean NXDOMAIN detection
Open DNS Lookup
WHOIS Lookup
Look up registrar, creation date, expiration date, and nameservers for any domain. Queries the authoritative registry directly, no scraped data.
Registrar and registration dates
Expiration date and renewal status
Nameservers (NS records)
Works with .com, .net, .org, .io, .dev, .uk & more
Open WHOIS Lookup
Website Speed Test
Run a Core Web Vitals audit on any URL. Get Lighthouse-style scores plus a plain-English breakdown of the top 3 fixes, no jargon.
Core Web Vitals scorecard
AI-summarized fixes in plain English
Mobile and desktop scores
200 audits per day site-wide (free)
Open Speed Test