SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
act-studio.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for act-studio.co.jp
Self-signed- Issued by (CA)
- Unspecified
- Subject
- ns.act-studio.co.jp
- Valid from
- Dec 2, 2025
- Valid until
- Dec 2, 2026 (23 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 08C001465F1D3AB5
- SHA-256 fingerprint
- 07:3A:FA:A9:DB:7B:34:25:A5:31:13:BF:A6:67:63:C1:42:9F:9F:08:7B:1F:B3:D5:3B:CC:B7:DB:9A:09:BA:9B
- Chain
- ns.act-studio.co.jp
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 24, 2026.
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This is today's certificate. Turn on monitoring and we'll watch act-studio.co.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, CNAME, TXT 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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