SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
open-uk.org
SSL/TLS Certificate
SSL/TLS Certificate for open-uk.org
Valid- Issued by (CA)
- Amazon
- Subject
- open-uk.org
- Valid from
- Jun 16, 2026
- Valid until
- Dec 30, 2026 (94 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0D3D788BE6FD2B02C91B9EFCCED2E1A7
- SHA-256 fingerprint
- 12:04:87:1D:8B:E1:F6:4A:75:EC:8D:30:AD:3F:7A:87:F2:97:E9:58:55:F4:BB:7F:F2:4C:0F:2F:CE:8D:BF:90
- Chain
- Amazon RSA 2048 M04 → Amazon Root CA 1 → Starfield Services 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 open-uk.org's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch open-uk.org 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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