SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sec.rocks
SSL/TLS Certificate
SSL/TLS Certificate for sec.rocks
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sec.rocks
- Valid from
- Aug 20, 2026
- Valid until
- Nov 18, 2026 (64 days remaining)
- Public key
- EC 256-bit
- Serial
- 05568E850CAE06D055C5C7D692E12893D400
- SHA-256 fingerprint
- A4:DC:F6:A7:2B:91:F5:E4:49:F0:2B:C7:71:62:D1:BC:86:9F:BA:C5:6C:13:64:E0:73:51:5F:F7:BF:35:4C:F4
- Chain
- YE1 → 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 Aug 20, 2026.
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This is today's certificate. Turn on monitoring and we'll watch sec.rocks 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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