SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
active-online.de
SSL/TLS Certificate
SSL/TLS Certificate for active-online.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- active-online.de
- Valid from
- Oct 22, 2026
- Valid until
- Jan 20, 2027 (75 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05813B61DABE5847C88E690BF4DBDD08E4DE
- SHA-256 fingerprint
- 1B:8B:BC:D1:7B:0F:7C:8F:3F:36:C3:20:69:10:38:09:62:2D:52:5B:8A:BE:25:79:19:D4:EA:13:18:44:DE:3C
- 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.
This certificate has been served since Sep 29, 2026.
Never get surprised by active-online.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch active-online.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.
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