SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
derer-tec.de
SSL/TLS Certificate
SSL/TLS Certificate for derer-tec.de
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- derer-tec.de
- Valid from
- Sep 27, 2025
- Valid until
- Oct 18, 2026 (42 days remaining)
- Public key
- RSA 2048-bit
- Serial
- CB937AEFAF12A56927D37E40A52A2CE3
- SHA-256 fingerprint
- A9:A9:D8:BA:B8:A5:AB:50:29:25:FD:41:63:3E:BF:67:CA:A6:5A:CA:28:D9:38:C0:71:EF:A0:24:9E:7F:E8:2B
- Chain
- Sectigo Public Server Authentication CA DV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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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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