SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
spera-foundation.org
SSL/TLS Certificate
SSL/TLS Certificate for spera-foundation.org
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- spera-foundation.org
- Valid from
- Jul 10, 2026
- Valid until
- Oct 8, 2026 (35 days remaining)
- Public key
- EC 256-bit
- Serial
- 05476F027402CBD7C437813AC58A10201FA8
- SHA-256 fingerprint
- F4:C8:9E:DB:04:45:FD:C9:57:24:0D:34:3F:AD:08:E1:56:AC:8E:A1:D2:B1:BA:D0:96:42:C8:12:62:00:7D:F7
- 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 Sep 2, 2026.
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This is today's certificate. Turn on monitoring and we'll watch spera-foundation.org continuously, notifying you the moment anything moves across all three signals:
Uptime
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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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