SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
os-tech.de
SSL/TLS Certificate
SSL/TLS Certificate for os-tech.de
Valid- Issued by (CA)
- Starfield Technologies, Inc.
- Subject
- www.os-tech.de
- Valid from
- Feb 27, 2026
- Valid until
- Feb 27, 2027 (215 days remaining)
- Public key
- RSA 4096-bit
- Serial
- CF10905103FC7507
- SHA-256 fingerprint
- B9:05:98:94:8E:6E:3E:75:43:0C:22:B2:11:4E:37:0A:C8:DE:4F:B0:0E:2A:A8:9F:21:A1:63:78:A8:F8:27:83
- Chain
- Starfield Secure Certificate Authority - G2 → Starfield Root Certificate Authority - G2
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by os-tech.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch os-tech.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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