SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
a-tec-architekturbuero.de
SSL/TLS Certificate
SSL/TLS Certificate for a-tec-architekturbuero.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- a-tec-architekturbuero.de
- Valid from
- Oct 4, 2026
- Valid until
- Jan 2, 2027 (47 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 054D3000186F5DA80357C33B53A05217F516
- SHA-256 fingerprint
- 91:A2:01:A0:52:11:1E:A1:DB:CC:D9:DF:DC:88:E9:40:8F:41:A2:1F:96:E6:E2:E8:9A:3C:0C:6C:03:14:A6:84
- 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.
Never get surprised by a-tec-architekturbuero.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch a-tec-architekturbuero.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.