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 s-42.net
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.simply42.at
- Valid from
- Jul 6, 2026
- Valid until
- Oct 4, 2026 (74 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0565B394ED59BA241EBC46B9273FE2051F28
- SHA-256 fingerprint
- 0D:74:B1:F6:45:68:CF:43:0C:EB:08:D0:5C:6A:A0:5F:A6:C7:F3:E8:FD:37:7B:40:1E:6B:3B:F5:D9:1A:D5:22
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by s-42.net's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch s-42.net 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, 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.