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 - March 2019
| Rank | ISP | Speed Mbps | Previous Mbps | Rank Change | Type | |
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| 1 | au Hikari (KDDI) | 4.45 | 4.46 | No change |
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| 2 | Softbank - Fiber | 4.15 | 4.16 | No change |
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| 3 | eo Hikari (K-Opticom) | 3.91 | 3.90 | +1 |
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| 4 | UCOM | 3.88 | 3.90 | -1 |
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| 5 | So-net | 3.72 | 3.70 | +1 |
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| 6 | Tokai Communications | 3.69 | 3.69 | +1 |
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| 7 | iTSCOM | 3.69 | 3.71 | -2 |
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| 8 | OCN (NTT Com) | 3.66 | 3.65 | No change |
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| 9 | IIJ | 3.66 | 3.62 | No change |
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| 10 | J:COM | 3.58 | 3.57 | No change |
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| 11 | Asahi Net | 3.48 | 3.47 | No change |
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| 12 | VECTANT | 3.47 | 3.44 | No change |
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| 13 | BIGLOBE | 3.33 | 3.34 | No change |
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| 14 | NIFTY | 2.94 | 2.72 | +2 |
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| 15 | KDDI Cable/DSL/Wireless | 2.87 | 2.86 | -1 |
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| 16 | NTTPC InfoSphere | 2.80 | 2.73 | -1 |
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| 17 | Softbank - DSL | 2.31 | 2.32 | No change |
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| 18 | Freebit | 2.29 | 2.16 | No change |
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