SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
tegenkanker.nl
SSL/TLS Certificate
SSL/TLS Certificate for tegenkanker.nl
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- *.tegenkanker.nl
- Valid from
- Aug 1, 2026
- Valid until
- Feb 15, 2027 (129 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 940C5D4706BB0C00592327F5B1B45C47
- SHA-256 fingerprint
- 1C:73:B3:0C:88:82:68:16:8B:10:F0:CE:F1:19:BA:0B:96:0A:BB:D5:8F:84:9A:6D:E3:35:9A:A0:19:A7:A2:31
- Chain
- Sectigo Public Server Authentication CA DV R36 → 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.
This certificate has been served since Sep 11, 2026.
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This is today's certificate. Turn on monitoring and we'll watch tegenkanker.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.
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