SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
the80-20rule.com
SSL/TLS Certificate
SSL/TLS Certificate for the80-20rule.com
Hostname mismatch- Issued by (CA)
- Microsoft Corporation
- Subject
- www.microsoft.com
- Valid from
- Jan 22, 2026
- Valid until
- Jan 17, 2027 (131 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 43000253929E1C999055F04653000000025392
- SHA-256 fingerprint
- 9F:17:B5:48:F7:D2:4F:30:9D:BC:AA:B5:71:57:6C:0C:A7:3B:80:55:9C:E6:9F:27:FE:29:5F:64:08:CC:57:BF
- Chain
- Microsoft TLS G2 RSA CA OCSP 04 → Microsoft TLS RSA Root G2 → DigiCert Global Root G2
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Aug 11, 2026.
Never get surprised by the80-20rule.com's certificate expiring
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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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