SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
c-mark.nl
SSL/TLS Certificate
SSL/TLS Certificate for c-mark.nl
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- c-mark.nl
- Valid from
- Oct 7, 2026
- Valid until
- Apr 23, 2027 (189 days remaining)
- Public key
- RSA 4096-bit
- Serial
- EB4F33F299417153457F36F69EBE50EF
- SHA-256 fingerprint
- B1:EA:60:3B:A0:BE:01:6E:14:58:B9:CA:70:F5:3D:F0:A6:F4:4C:82:AA:41:16:97:FD:BC:32:7A:A7:2B:72:F6
- Chain
- Sectigo Public Server Authentication CA OV R40 → Sectigo Public Server Authentication Root R46
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 Oct 1, 2026.
Never get surprised by c-mark.nl's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch c-mark.nl 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.