SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sfr-school.org
SSL/TLS Certificate
SSL/TLS Certificate for sfr-school.org
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sfr-school.org
- Valid from
- Oct 3, 2026
- Valid until
- Jan 1, 2027 (48 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05F54D7260671A498541F14C3B99849A198E
- SHA-256 fingerprint
- FC:CA:F5:9F:23:C9:69:AE:9F:0F:F4:33:39:FF:B4:15:2D:68:7D:34:5B:2E:39:E5:DE:8F:8B:45:E4:8D:BF:A8
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
We've observed 1 previous certificate for this host. This certificate has been served since Oct 11, 2026.
Never get surprised by sfr-school.org's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sfr-school.org 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, CNAME, TXT 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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