SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
held-optic.de
SSL/TLS Certificate
SSL/TLS Certificate for held-optic.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- held-optic.de
- Valid from
- Sep 6, 2026
- Valid until
- Dec 5, 2026 (57 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05995E56360F75A0A228B2869C2C16F51D0F
- SHA-256 fingerprint
- 43:12:9C:1A:04:D3:AC:52:2E:34:5C:49:FB:AD:FB:8E:40:DD:47:7D:CE:35:23:16:23:39:2F:DF:C3:A7:79:0B
- 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 held-optic.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch held-optic.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.
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