SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
act-running.com
SSL/TLS Certificate
SSL/TLS Certificate for act-running.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- act-running.com
- Valid from
- Aug 3, 2026
- Valid until
- Nov 1, 2026 (60 days remaining)
- Public key
- EC 256-bit
- Serial
- 06D8DAAA1399D678339472F394465CB309D7
- SHA-256 fingerprint
- F5:8B:5B:68:06:5E:F8:54:DA:B6:DC:27:E3:49:42:9C:C5:3B:59:FD:41:54:D4:77:FF:35:6B:81:39:4F:45:AA
- Chain
- YE2 → 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.
This certificate has been served since Aug 31, 2026.
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This is today's certificate. Turn on monitoring and we'll watch act-running.com 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, 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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