SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
res-publica.at
SSL/TLS Certificate
SSL/TLS Certificate for res-publica.at
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- res-publica.at
- Valid from
- Jun 21, 2026
- Valid until
- Sep 19, 2026 (54 days remaining)
- Public key
- EC 256-bit
- Serial
- 058033363A6E237B1A903F16BD6A9D5F07D7
- SHA-256 fingerprint
- B1:C9:0C:E7:30:49:8D:9B:30:EC:19:35:AE:DC:10:2B:35:E5:46:22:E5:57:90:4A:AB:7F:1B:68:9E:D2:7D:D6
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).
Never get surprised by res-publica.at's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch res-publica.at 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.