SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
open-commons.org
SSL/TLS Certificate
SSL/TLS Certificate for open-commons.org
Hostname mismatch- Issued by (CA)
- DigiCert Inc
- Subject
- *.linz.at
- Valid from
- Dec 2, 2025
- Valid until
- Dec 1, 2026 (74 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0F867C88E7B710D842136B2C5F571C63
- SHA-256 fingerprint
- 1A:93:46:D5:6B:3B:0A:D7:BD:2F:5F:71:3A:CF:38:4D:2A:AC:DF:D3:E2:FB:BF:8C:AE:62:83:36:E9:FB:15:A6
- Chain
- RapidSSL TLS RSA CA G1 → DigiCert Global Root G2
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by open-commons.org's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch open-commons.org 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.