SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
act-web.co.jp
SSL/TLS Certificate
SSL/TLS Certificate for act-web.co.jp
Valid- Issued by (CA)
- GlobalSign nv-sa
- Subject
- www.act-web.co.jp
- Valid from
- Nov 17, 2025
- Valid until
- Dec 19, 2026 (40 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 698FDD9B48497B91673E18AF
- SHA-256 fingerprint
- 05:35:47:1F:1A:21:A6:EA:A4:E2:60:47:9C:43:9E:6B:48:C7:26:D2:E8:AC:6D:4D:80:78:07:1C:74:E3:3D:5A
- Chain
- GlobalSign GCC R6 AlphaSSL CA 2025 → GlobalSign
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 Oct 6, 2026.
Never get surprised by act-web.co.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch act-web.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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