SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for a-b-c.ch
Valid- Issued by (CA)
- GlobalSign nv-sa
- Subject
- *.a-b-c.ch
- Valid from
- Feb 16, 2026
- Valid until
- Mar 20, 2027 (166 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 27678EDE51D4C94CBF5D8442
- SHA-256 fingerprint
- B7:F0:48:DC:D3:F8:8A:EA:46:86:F2:C6:B3:37:B0:F0:97:D4:B1:F3:3F:38:4F:F8:C1:F7:1E:94:A5:29:4D:D1
- Chain
- GlobalSign GCC R6 AlphaSSL CA 2025 → GlobalSign
Certificate Authority Authorization (CAA)
The serving CA (GlobalSign nv-sa) is authorized by this domain's CAA records (globalsign.com, letsencrypt.org).
This certificate has been served since Jul 25, 2026.
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Uptime
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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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