Japan Internet Speed Test
Free Japan speed test (回線速度テスト). Measure your NTT, NURO or au Hikari fibre line and compare against Japan's very high national averages.
Top ISPs in Japan
These are the most common providers our users in Japan test against:
- NTT FLET'S
- au Hikari
- SoftBank Hikari
- NURO
- OCN
What NetStartr measures for Japan users
Click the button above and we measure download speed, upload speed, ping, jitter and packet loss in roughly 20 seconds. We benchmark against the Japan averages (195 / 145 / 12 ms) so you can immediately tell whether your line is performing as expected for your country or state.
The test runs entirely in your browser using Cloudflare\'s global edge — no signup, no app install, no data sold. After the test, we tell you what your connection is good for (4K streaming, gaming, calls) and how much of your ISP\'s advertised plan you\'re actually getting.
Get accurate results
- Test from a wired Ethernet connection if possible.
- Pause cloud syncs (iCloud, Drive, Dropbox).
- Run the test 2-3 times and take the median.
- Test at peak (evening) and off-peak (morning) to spot ISP congestion.