SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
astris-school.com
SSL/TLS Certificate
SSL/TLS Certificate for astris-school.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.astris-school.com
- Valid from
- Sep 27, 2026
- Valid until
- Dec 26, 2026 (76 days remaining)
- Public key
- EC 384-bit
- Serial
- 05984FA40E0A8CA25586BAE823ECF1AC88CA
- SHA-256 fingerprint
- 00:B1:CB:2E:85:70:E3:69:AA:2B:22:75:41:69:D5:09:48:7C:F6:3C:ED:EB:22:00:CB:E2:55:73:40:16:07:38
- Chain
- YE1 → 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 Oct 9, 2026.
Never get surprised by astris-school.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch astris-school.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.