SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
bt-admin.de
SSL/TLS Certificate
SSL/TLS Certificate for bt-admin.de
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- bt-admin.de
- Valid from
- Jan 17, 2026
- Valid until
- Feb 7, 2027 (94 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 94664C94886188D005EED6DC5CB0D915
- SHA-256 fingerprint
- 58:E9:2E:8C:D2:80:D7:7A:8A:06:0F:55:17:CA:E0:DF:09:01:2B:17:E2:00:A4:10:B1:56:F5:C5:90:98:AC:F3
- 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.
This certificate has been served since Nov 3, 2026.
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Uptime
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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.
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