SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
catena-system.swiss
SSL/TLS Certificate
SSL/TLS Certificate for catena-system.swiss
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- catena-system.swiss
- Valid from
- Sep 20, 2026
- Valid until
- Dec 19, 2026 (61 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05F434870C41A2088DFA97B88ABE879215E3
- SHA-256 fingerprint
- F1:08:FF:3C:AA:CF:A3:3C:73:76:BD:4C:31:A3:A9:00:74:FC:5F:AA:51:C3:92:3C:08:D4:8F:D2:55:A8:2D:DD
- 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.
This certificate has been served since Sep 24, 2026.
Never get surprised by catena-system.swiss's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch catena-system.swiss 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.