SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
root-servers.org
SSL/TLS Certificate
SSL/TLS Certificate for root-servers.org
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- root-servers.org
- Valid from
- Sep 2, 2026
- Valid until
- Dec 1, 2026 (87 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0531CCA5464E41F98F9B5E9F07F0448F7863
- SHA-256 fingerprint
- 06:3C:13:3A:50:BC:2B:11:A7:EE:F6:9B:F0:B8:C7:A3:BA:38:F9:5C:80:75:AE:61:C6:8C:1A:0D:BD:DC:43:56
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (digicert.com, letsencrypt.org).
We've observed 1 previous certificate for this host. This certificate has been served since Sep 4, 2026.
Never get surprised by root-servers.org's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch root-servers.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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