SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
oltmanns-gmbh.de
SSL/TLS Certificate
SSL/TLS Certificate for oltmanns-gmbh.de
Expired- Issued by (CA)
- Starfield Technologies, Inc.
- Subject
- www.op-engineers.de
- Valid from
- Apr 13, 2022
- Valid until
- Apr 13, 2023 (expired 1214 days ago)
- Public key
- RSA 4096-bit
- Serial
- 24C2F199E6386025
- SHA-256 fingerprint
- 12:F5:79:78:6F:61:83:7D:50:56:9E:CF:38:C1:17:56:B4:FB:5A:F3:C4:A8:56:36:54:81:75:6E:C1:05:81:35
- 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 oltmanns-gmbh.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch oltmanns-gmbh.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.