SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
bielefeld-aktiv.de
SSL/TLS Certificate
SSL/TLS Certificate for bielefeld-aktiv.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- bielefeld-aktiv.de
- Valid from
- Jun 23, 2026
- Valid until
- Sep 21, 2026 (42 days remaining)
- Public key
- EC 256-bit
- Serial
- 053C623003A1E989C1452076104F7F0A058F
- SHA-256 fingerprint
- D1:FD:F9:F7:F1:A8:32:1E:18:28:41:9B:AE:42:96:55:53:25:17:7D:14:6D:C0:D8:B9:8D:B6:F4:1B:86:C0:DC
- Chain
- YE2 → Root YE → ISRG Root X2 → 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 bielefeld-aktiv.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch bielefeld-aktiv.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, 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.