SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
wrs-schulwiki.de
SSL/TLS Certificate
SSL/TLS Certificate for wrs-schulwiki.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- wrs-schulwiki.de
- Valid from
- Jun 1, 2026
- Valid until
- Aug 30, 2026 (35 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 06791B94C8B54D2F8F09CBA284CC5DB61BEE
- SHA-256 fingerprint
- 78:33:B8:4D:96:D4:5B:6A:85:1A:F4:44:D0:86:0E:9B:D2:12:41:31:E7:AB:BB:C6:8B:FB:CB:55:12:DC:0C:64
- 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.
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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, 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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