SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ruf-inc.com
SSL/TLS Certificate
SSL/TLS Certificate for ruf-inc.com
Expired- Issued by (CA)
- Let's Encrypt
- Subject
- drstephaniejohnson.com
- Valid from
- Sep 26, 2025
- Valid until
- Dec 25, 2025 (expired 269 days ago)
- Public key
- EC 256-bit
- Serial
- 06234004E10C2866F75E37B95C864A0ED15A
- SHA-256 fingerprint
- 56:4E:DF:FB:AB:55:83:8C:3E:79:26:E6:25:E9:12:A7:D8:19:BC:AC:6F:39:E7:85:42:AF:BA:E7:91:66:C3:F5
- Chain
- E8 → 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 2 previous certificates for this host. This certificate has been served since Sep 17, 2026.
Never get surprised by ruf-inc.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch ruf-inc.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.