SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
archivum-secretum.org
SSL/TLS Certificate
SSL/TLS Certificate for archivum-secretum.org
Expired- Issued by (CA)
- Let's Encrypt
- Subject
- archivum-secretum.org
- Valid from
- Feb 10, 2025
- Valid until
- May 11, 2025 (expired 528 days ago)
- Public key
- EC 256-bit
- Serial
- 036EC3B6EBAC8028D53FCB9A05CF2E9DECE4
- SHA-256 fingerprint
- 2A:28:85:CE:43:12:F7:1C:17:2B:7E:06:BE:B8:A9:83:E5:BB:58:0F:41:EB:F0:04:DD:63:1E:53:65:2F:14:33
- Chain
- E5 → 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 26, 2026.
Never get surprised by archivum-secretum.org's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch archivum-secretum.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.