SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
op-tec.com
SSL/TLS Certificate
SSL/TLS Certificate for op-tec.com
Valid- Issued by (CA)
- ZeroSSL GmbH
- Subject
- op-tec.com
- Valid from
- Jul 22, 2026
- Valid until
- Oct 20, 2026 (88 days remaining)
- Public key
- EC 384-bit
- Serial
- 4209811E37CAA0D4D6D420C745EF92F4
- SHA-256 fingerprint
- F0:09:AE:6A:5A:20:61:C8:3B:CE:F2:40:0F:DA:A6:CF:C6:AB:59:9D:A5:1F:B8:45:8D:38:95:D7:98:7E:FA:4A
- Chain
- ZeroSSL ECC DV SSL CA 2 → Sectigo Public Server Authentication Root E46 → USERTrust ECC Certification Authority
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by op-tec.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch op-tec.com 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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