SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
onetime-file.com
SSL/TLS Certificate
SSL/TLS Certificate for onetime-file.com
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- www.onetime-file.com
- Valid from
- Aug 23, 2026
- Valid until
- Nov 21, 2026 (78 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05934403C2396AA3783875E3866F77BEFBDE
- SHA-256 fingerprint
- 0F:B0:CC:99:FF:95:2C:63:0B:EB:1A:45:19:BC:3C:54:6E:98:45:FA:58:BF:4A:07:5F:81:57:6F:61:DD:2C:34
- 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 Aug 27, 2026.
Never get surprised by onetime-file.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch onetime-file.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.