SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sec-it.nl
SSL/TLS Certificate
SSL/TLS Certificate for sec-it.nl
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sec-it.nl
- Valid from
- Jun 5, 2026
- Valid until
- Sep 3, 2026 (32 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0625F0FA6805F2A207A9712DF6B29C8B468D
- SHA-256 fingerprint
- FC:52:25:E0:BB:C7:8C:37:A8:0B:15:E6:07:8D:E4:1E:53:28:96:34:AE:74:81:86:45:97:AD:5A:4C:4C:F3:47
- 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 (letsencrypt.org, sectigo.com).
Never get surprised by sec-it.nl's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sec-it.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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