Free SSL & DNS Checker
Enter any domain to see its TLS certificate expiry, issuer, and live DNS records — instantly, with no signup. Then let Merlonix watch it for you around the clock.
What this checks
The checker reads the same public signals Merlonix monitors continuously: your TLS certificate's issuer, validity window, days until expiry, and the hostnames it covers, plus the domain's A/AAAA, MX, and NS records. Everything here is public information — no account or verification needed.
Why it matters
An expired certificate takes a site offline for every visitor and erodes trust instantly. DNS drift can silently reroute traffic or break email. A one-time check tells you where things stand today; continuous monitoring is what catches the expiry that's 21 days out — before it becomes an incident.
From snapshot to monitoring
Merlonix watches SSL expiry, DNS configuration, and uptime across every domain you (or your clients) depend on, and alerts you the moment something changes. Run a check above, then start a free 14-day trial to keep an eye on it for good.