SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
on-off-app.com
SSL/TLS Certificate
SSL/TLS Certificate for on-off-app.com
Self-signed- Issued by (CA)
- *.on-off-app.com
- Subject
- *.on-off-app.com
- Valid from
- Apr 4, 2017
- Valid until
- Apr 2, 2027 (227 days remaining)
- Public key
- RSA 2048-bit
- Serial
- A2CC40F2728A2787
- SHA-256 fingerprint
- 9F:6F:14:4A:96:47:63:E9:CC:1D:2C:29:E0:B6:FC:F8:22:20:EF:7B:82:EF:AB:DB:B0:5B:2F:A5:74:E5:F0:01
- Chain
- *.on-off-app.com
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 Aug 13, 2026.
Never get surprised by on-off-app.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch on-off-app.com 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.