SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
umwelt-portal.com
SSL/TLS Certificate
SSL/TLS Certificate for umwelt-portal.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.umwelt-portal.vanspeyk12.nl
- Valid from
- Sep 19, 2026
- Valid until
- Dec 18, 2026 (42 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0542CBF98C03453AD996D5AF917994DAA832
- SHA-256 fingerprint
- BD:69:7A:A7:40:93:94:61:24:F8:6D:80:58:A3:5B:71:54:71:6E:CA:24:E2:25:3A:EE:30:96:F8:6C:AF:DA:7B
- 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.
This certificate has been served since Oct 4, 2026.
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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, CNAME, TXT 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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