SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
aoi-umi.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for aoi-umi.co.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- aoi-umi.co.jp
- Valid from
- Jun 28, 2026
- Valid until
- Sep 26, 2026 (46 days remaining)
- Public key
- EC 256-bit
- Serial
- 0513B39123344F7634C472C60B72AEA70A57
- SHA-256 fingerprint
- 38:9B:54:11:56:B2:21:7A:88:BD:4B:49:59:5A:A1:6E:BB:54:DD:D1:B9:2F:BB:FC:A3:B1:C5:E6:B9:E7:65:14
- Chain
- YE1 → Root YE → ISRG Root X2 → 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
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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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