SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
alt-bau.de
SSL/TLS Certificate
SSL/TLS Certificate for alt-bau.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- alt-bau.de
- Valid from
- Sep 5, 2026
- Valid until
- Dec 4, 2026 (47 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 062006497CEE268B4344B102CCF5BAB9D1F3
- SHA-256 fingerprint
- C5:8E:C1:83:C2:D1:DC:16:DF:73:B5:E0:E5:A9:08:F2:A2:B9:15:8F:34:32:AE:B7:E2:96:A5:B4:71:27:1E:CE
- 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 Sep 27, 2026.
Never get surprised by alt-bau.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch alt-bau.de continuously, notifying you the moment anything moves across all three signals:
Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.