SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
stl-horizon.com
SSL/TLS Certificate
SSL/TLS Certificate for stl-horizon.com
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- *.stl-horizon.com
- Valid from
- Jan 13, 2026
- Valid until
- Feb 11, 2027 (96 days remaining)
- Public key
- RSA 2048-bit
- Serial
- D21E50904553097C3CF3459BA24FB6A2
- SHA-256 fingerprint
- 62:8B:BC:7B:B8:90:B5:08:19:B9:6F:9D:21:B3:E1:90:22:74:95:5B:AC:72:A3:62:36:9F:68:E1:D5:B2:B2:D6
- 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.
This certificate has been served since Sep 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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