SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ro-tec.jp
SSL/TLS Certificate
SSL/TLS Certificate for ro-tec.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.ro-tec.jp
- Valid from
- Aug 12, 2026
- Valid until
- Nov 10, 2026 (67 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06B5DC1E0B320E8BF1AF59867AF99222DFB2
- SHA-256 fingerprint
- BE:94:E7:EF:5B:66:E4:36:43:40:D0:E8:A7:F7:2E:C0:5B:A9:DD:9A:9A:AF:19:4C:89:DD:B5:3A:E2:D6:64:13
- Chain
- YR1 → Root YR → ISRG Root X1
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 Sep 1, 2026.
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This is today's certificate. Turn on monitoring and we'll watch ro-tec.jp 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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