SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sekiguchi-f.com
SSL/TLS Certificate
SSL/TLS Certificate for sekiguchi-f.com
Valid- Issued by (CA)
- DigiCert Inc
- Subject
- www.sekiguchi-f.com
- Valid from
- May 30, 2026
- Valid until
- Dec 14, 2026 (101 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0729C1E6B29FE9036B13640A8DEF8516
- SHA-256 fingerprint
- 2B:7C:F3:12:F9:96:A4:3C:95:34:AE:74:9A:53:47:CF:FD:31:2B:DA:C9:89:B0:2D:B2:A5:CF:A9:22:CC:80:6F
- Chain
- RapidSSL TLS RSA CA G1 → DigiCert Global Root G2
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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