SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
o-ritter.de
SSL/TLS Certificate
SSL/TLS Certificate for o-ritter.de
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- www.o-ritter.de
- Valid from
- Mar 23, 2026
- Valid until
- Oct 7, 2026 (28 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 97CBC410F09A23906B4BAB5E77FF2183
- SHA-256 fingerprint
- CA:6F:45:DC:21:C0:3B:0C:1E:43:88:29:D6:FC:BE:E3:79:16:25:59:C2:67:E0:DF:7E:C6:12:8C:C2:7D:12:9A
- Chain
- Sectigo Public Server Authentication CA DV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
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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