F
Post-quantum TLS readiness
japanet.co.jp
Critical issue to fix first
Short answer
No. As of 2026-11-03, japanet.co.jp does not negotiate post-quantum key exchange; it uses secp256r1 over TLSv1.2 (Quantum Aether grade F), so recorded traffic is exposed to harvest-now-decrypt-later.
| Grade | F |
|---|---|
| Key exchange | secp256r1 |
| Post-quantum | no (classical) |
| TLS | TLSv1.2 |
| Hosting network | Internet Initiative Japan Inc. |
| Tranco rank | #8807 |
| Country | 🇯🇵 Japan: #19/26 (42.2%) |
From our weekly tracker of the top 10,000 sites, scanned on 2026-11-03 · /adoption
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[](https://ather-quatum.cloud/?domain=japanet.co.jp)