SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
a-s-tec.de
SSL/TLS Certificate
SSL/TLS Certificate for a-s-tec.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- a-s-tec.de
- Valid from
- Sep 20, 2026
- Valid until
- Dec 19, 2026 (88 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06BB19C63854B5A17E0D4B956458BDC7B409
- SHA-256 fingerprint
- 1A:DA:51:41:98:FA:64:9D:72:B0:99:A0:26:80:70:CB:F3:11:6A:0F:21:30:F6:66:E5:50:C3:34:84:B2:91:5E
- Chain
- YR1 → Root YR → ISRG Root X1
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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