SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
fs-school.org
SSL/TLS Certificate
SSL/TLS Certificate for fs-school.org
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- fs-school.org
- Valid from
- Aug 19, 2026
- Valid until
- Nov 17, 2026 (66 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 056C5E5603D6B249A2169DCF3AF7CB82104E
- SHA-256 fingerprint
- E3:9E:82:8F:51:F4:49:25:ED:28:65:85:D9:7D:C9:BA:15:7C:77:A2:30:0B:7D:05:7B:53:E0:4B:DB:F6:E7:C2
- 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.
This certificate has been served since Aug 27, 2026.
Never get surprised by fs-school.org's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch fs-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, 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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