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-f-s.ch
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- *.a-f-s.ch
- Valid from
- Oct 6, 2026
- Valid until
- Jan 4, 2027 (61 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 054A2F1DCC8D8E46D4A4F849661798BF8370
- SHA-256 fingerprint
- 24:A0:D4:52:DE:23:D4:28:8A:E1:71:93:EB:D3:CA:C8:37:B5:82:C9:AC:AA:E4:36:C2:BC:81:C5:28:92:A0:D1
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Oct 10, 2026.
Never get surprised by a-f-s.ch's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch a-f-s.ch continuously, notifying you the moment anything moves across all three signals:
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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