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-o.ca
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- s-o.ca
- Valid from
- Jun 29, 2026
- Valid until
- Sep 27, 2026 (56 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05D75833F9FE501F64B60983ED9E2266D073
- SHA-256 fingerprint
- 8C:A1:F9:8F:4F:C1:0C:78:30:A5:5F:95:FA:1F:93:3C:A2:AB:FB:E3:42:B3:EF:2E:67:77:4F:EF:D5:EA:D6:B6
- 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-o.ca's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch s-o.ca 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.