SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
bau-ab.de
SSL/TLS Certificate
SSL/TLS Certificate for bau-ab.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- bau-ab.de
- Valid from
- Sep 22, 2026
- Valid until
- Dec 21, 2026 (38 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 052550AEA800C41BB36CF42FDF01D441E66F
- SHA-256 fingerprint
- EB:4A:F4:70:54:83:02:1F:21:1C:AF:0F:0B:66:F2:BF:91:13:33:16:0E:56:2A:EE:5A:AC:24:01:6F:D1:48:94
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
We've observed 1 previous certificate for this host. This certificate has been served since Oct 7, 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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