SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for big12.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- big12.de
- Valid from
- Aug 29, 2026
- Valid until
- Nov 27, 2026 (59 days remaining)
- Public key
- EC 384-bit
- Serial
- 0678213E550C9824B82E9FD9F20F164E7967
- SHA-256 fingerprint
- 57:7C:FC:34:60:BA:13:27:A7:FB:1A:E5:1A:70:57:EA:7B:0F:7C:CD:E3:98:59:F0:F5:29:67:CD:38:FE:C1:64
- Chain
- YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org, sectigo.com).
Never get surprised by big12.de's certificate expiring
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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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