SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
what-matters.fr
SSL/TLS Certificate
SSL/TLS Certificate for what-matters.fr
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- what-matters.fr
- Valid from
- Jun 12, 2026
- Valid until
- Sep 10, 2026 (35 days remaining)
- Public key
- EC 256-bit
- Serial
- 055C482877EF77AF29C43D70279E2F3678D8
- SHA-256 fingerprint
- BE:4C:10:FC:FB:F4:27:41:79:CD:E1:F9:4B:CF:C6:06:8F:D0:94:D1:3F:92:56:E0:95:C0:1C:CA:E2:99:D1:29
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Jul 28, 2026.
Never get surprised by what-matters.fr's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch what-matters.fr continuously, notifying you the moment anything moves across all three signals:
Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
Free for your first domain: uptime, DNS, and certificate together. No credit card.