SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
av-test.org
SSL/TLS Certificate
SSL/TLS Certificate for av-test.org
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- av-test.org
- Valid from
- Aug 7, 2026
- Valid until
- Nov 5, 2026 (61 days remaining)
- Public key
- EC 256-bit
- Serial
- 05DF28599DE2F33D87E964993519794E6472
- SHA-256 fingerprint
- 70:67:C0:47:FB:98:21:2C:03:E1:02:00:15:DF:4B:0D:87:0E:F8:BF:72:80:F5:41:55:C4:F4:E1:31:88:9C:73
- Chain
- YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org, thawte.com).
Never get surprised by av-test.org's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch av-test.org 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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