SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
open-group.com
SSL/TLS Certificate
SSL/TLS Certificate for open-group.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- *.open-group.com.ar
- Valid from
- Sep 9, 2026
- Valid until
- Dec 8, 2026 (69 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05CF3D65560ADA60507A2D4A67233B9B3E71
- SHA-256 fingerprint
- 32:57:79:B7:6B:85:7D:FF:12:0B:FA:C2:1B:72:85:D1:D0:F1:7A:CB:8D:DE:B4:6A:77:BA:33:55:EB:E3:A5:94
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Sep 18, 2026.
Never get surprised by open-group.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch open-group.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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