SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
my-domain.com
SSL/TLS Certificate
SSL/TLS Certificate for my-domain.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- my-domain.com
- Valid from
- Sep 23, 2026
- Valid until
- Dec 22, 2026 (70 days remaining)
- Public key
- EC 256-bit
- Serial
- 0656EDA4CA9362E748B75871CA37C771DCD6
- SHA-256 fingerprint
- 91:79:7E:55:4A:6D:8F:55:A0:6D:C5:4F:8A:8C:95:25:F7:63:7C:D2:6D:58:67:12:7F:74:20:33:E5:33:C0:85
- Chain
- YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (comodoca.com, digicert.com, globalsign.com, letsencrypt.org, pki.goog, sectigo.com).
We've observed 1 previous certificate for this host. This certificate has been served since Sep 24, 2026.
Never get surprised by my-domain.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch my-domain.com 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.
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