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 as-t.ch
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- *.belb.ch
- Valid from
- Aug 25, 2026
- Valid until
- Nov 23, 2026 (54 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06DA59B83866B00E7069CFF12B34C62DA80C
- SHA-256 fingerprint
- 7F:2F:A6:44:AE:E0:DE:62:83:86:3A:48:7F:81:AA:21:96:10:0C:32:34:EE:5D:FC:D7:04:C0:A4:F7:EF:97:6D
- 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 Sep 24, 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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