SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for zk.me
Valid- Issued by (CA)
- Google Trust Services
- Subject
- zk.me
- Valid from
- Aug 15, 2026
- Valid until
- Nov 13, 2026 (71 days remaining)
- Public key
- EC 256-bit
- Serial
- 57CF52878EBD10A8130E4900F700C72D
- SHA-256 fingerprint
- 39:F0:59:E4:47:A6:48:D1:A3:81:B3:1B:96:F2:D8:C8:DE:19:9C:C8:F8:19:60:05:26:1A:68:CD:5B:92:04:11
- Chain
- WE1 → GTS Root R4
Certificate Authority Authorization (CAA)
The serving CA (Google Trust Services) is authorized by this domain's CAA records (comodoca.com, digicert.com, letsencrypt.org, mailto:contact@zk.me, pki.goog, ssl.com).
Never get surprised by zk.me's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch zk.me 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.