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 - January 2020
| Rank | ISP | Speed Mbps | Previous Mbps | Rank Change | Type | |
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| 1 | au Hikari (KDDI) | 4.26 | 4.31 | No change |
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| 2 | Softbank - Fiber | 3.98 | 4.05 | No change |
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| 3 | eo Hikari (K-Opticom) | 3.89 | 3.98 | No change |
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| 4 | UCOM | 3.64 | 3.74 | No change |
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| 5 | iTSCOM | 3.52 | 3.61 | No change |
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| 6 | Tokai Communications | 3.47 | 3.56 | No change |
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| 7 | So-net | 3.43 | 3.52 | No change |
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| 8 | OCN (NTT Com) | 3.43 | 3.51 | No change |
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| 9 | J:COM | 3.41 | 3.49 | No change |
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| 10 | Asahi Net | 3.32 | 3.41 | No change |
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| 11 | IIJ | 3.23 | 3.37 | No change |
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| 12 | BIGLOBE | 3.19 | 3.26 | No change |
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| 13 | NIFTY | 3.04 | 3.24 | No change |
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| 14 | KDDI Cable/DSL/Wireless | 3.02 | 3.08 | No change |
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| 15 | VECTANT | 2.90 | 2.95 | No change |
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| 16 | NTTPC InfoSphere | 2.89 | 2.92 | No change |
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| 17 | Softbank - DSL | 2.71 | 2.77 | No change |
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| 18 | Freebit | 2.53 | 2.70 | No change |
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