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Domain Expiry & SSL Certificate Monitor - DNS Change Alerts

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Never lose a domain or serve an expired certificate again. Checks domain expiry via RDAP, live TLS certificate expiry and validity, plus nameserver and DNS record changes. Warns before expiry and alerts when records move. No API key needed.

Pricing

from $2.00 / 1,000 domain checkeds

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Developer

mohamed alaya

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Monthly active users

17 days ago

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Domain, SSL & DNS Monitor

Three of the most expensive outages in tech are also the most preventable: a domain that quietly expired, a certificate nobody renewed, and DNS records that changed without anyone noticing. This watches all three.

What it checks

Domain (via RDAP, the structured successor to WHOIS) — registrar, registration status, DNSSEC, nameservers, and daysUntilDomainExpiry.

TLS certificate (read live off the socket, not from a third party) — issuer, subject, SAN list, fingerprint, daysUntilCertExpiry, and whether it actually validates.

DNS (over DNS-over-HTTPS) — A, AAAA, MX, NS, TXT and more, snapshotted and compared.

What raises an alert

Domain or certificate inside your warning window (expiryWarningDays, certWarningDays)
A certificate that no longer validates
Nameservers changed — often the first visible sign of a domain hijack
Certificate issuer changed, or registration status changed
Any watched DNS record changing

What deliberately does not alarm you

A rotated certificate fingerprint is reported but is not treated as critical on its own — Let's Encrypt renews every 60 days and flagging that as an incident would train you to ignore the alerts. A changed issuer is critical; a routine renewal is not.

DNS answers and nameserver lists are sorted before comparison, so a round-robin resolver returning the same records in a different order can never look like a change.

Typical uses

Agencies and MSPs watching client domains · security teams tracking hijack indicators · DevOps preventing certificate outages · anyone who has ever lost a domain to auto-renew failing silently.

Schedule it

Daily is right for expiry and DNS. Point webhookUrl at Slack and you will hear about a problem weeks before it becomes an outage.

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