SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ritto-shakyo.jp
SSL/TLS Certificate
SSL/TLS Certificate for ritto-shakyo.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- ritto-shakyo.jp
- Valid from
- Jul 19, 2026
- Valid until
- Oct 17, 2026 (68 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05BBC91D4B46D508106B14DD62E169A17508
- SHA-256 fingerprint
- 2B:D1:41:6E:B7:4B:24:5B:4E:8F:E9:4D:F4:D7:C8:47:90:10:A8:31:2A:79:3F:B2:B8:EA:D0:13:58:72:03:0A
- 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.
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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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