SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sec-check.net
SSL/TLS Certificate
SSL/TLS Certificate for sec-check.net
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.sec-check.net
- Valid from
- Sep 16, 2026
- Valid until
- Dec 15, 2026 (62 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0530A4393828E124899D3BE30D8FCDB840A8
- SHA-256 fingerprint
- 50:5E:83:61:7E:B3:CF:49:41:F5:C7:AB:4F:3B:ED:66:E6:89:1C:48:AF:5E:92:F6:B3:3D:04:3E:E2:CC:2A:B4
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
We've observed 1 previous certificate for this host. This certificate has been served since Sep 19, 2026.
Never get surprised by sec-check.net's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sec-check.net 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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