SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
act-u.com
SSL/TLS Certificate
SSL/TLS Certificate for act-u.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- act-u.com
- Valid from
- Jun 15, 2026
- Valid until
- Sep 13, 2026 (46 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05FCF7BC618431BAF81E236484116534F0FF
- SHA-256 fingerprint
- B7:B0:B7:EF:3B:27:42:38:6F:B5:15:B1:6A:CB:18:B9:00:57:3B:22:01:73:7E:51:48:FF:86:93:0F:44:1F:44
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by act-u.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch act-u.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.