SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
osamu-factory.jp
SSL/TLS Certificate
SSL/TLS Certificate for osamu-factory.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.osamu-factory.jp
- Valid from
- Jul 10, 2026
- Valid until
- Oct 8, 2026 (69 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05EF943CC35517D58E55E3F245235D2A87E7
- SHA-256 fingerprint
- 7F:6E:9B:35:AD:51:28:74:43:FC:3E:81:1A:7D:03:98:7E:3F:0F:92:8D:5B:E5:0F:35:ED:00:97:51:3F:27:A8
- 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 Jul 26, 2026.
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Uptime
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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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