Japan
The Netflix ISP Speed Index is a measure of prime time Netflix performance on particular ISPs (internet service providers) around the globe, and not a measure of overall performance for other services/data that may travel across the specific ISP network.
ISP Leaderboard - September 2019
| Rank | ISP | Speed Mbps | Previous Mbps | Rank Change | Type | |
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| 1 | au Hikari (KDDI) | 4.29 | 4.35 | No change |
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| 2 | Softbank - Fiber | 3.96 | 4.03 | No change |
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| 3 | eo Hikari (K-Opticom) | 3.85 | 3.90 | No change |
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| 4 | UCOM | 3.71 | 3.78 | No change |
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| 5 | iTSCOM | 3.52 | 3.62 | No change |
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| 6 | So-net | 3.47 | 3.55 | No change |
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| 7 | Tokai Communications | 3.45 | 3.48 | No change |
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| 8 | OCN (NTT Com) | 3.41 | 3.47 | No change |
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| 9 | J:COM | 3.36 | 3.41 | No change |
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| 10 | IIJ | 3.31 | 3.39 | No change |
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| 11 | Asahi Net | 3.27 | 3.33 | No change |
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| 12 | BIGLOBE | 3.05 | 3.18 | No change |
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| 13 | VECTANT | 2.82 | 3.04 | No change |
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| 14 | NIFTY | 2.81 | 2.95 | No change |
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| 15 | KDDI Cable/DSL/Wireless | 2.77 | 2.80 | No change |
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| 16 | NTTPC InfoSphere | 2.67 | 2.67 | No change |
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| 17 | Softbank - DSL | 2.32 | 2.31 | +1 |
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| 18 | Freebit | 2.27 | 2.33 | -1 |
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