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 - December 2019
| Rank | ISP | Speed Mbps | Previous Mbps | Rank Change | Type | |
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| 1 | au Hikari (KDDI) | 4.31 | 4.30 | No change |
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| 2 | Softbank - Fiber | 4.05 | 4.07 | No change |
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| 3 | eo Hikari (K-Opticom) | 3.98 | 3.99 | No change |
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| 4 | UCOM | 3.74 | 3.74 | No change |
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| 5 | iTSCOM | 3.61 | 3.64 | No change |
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| 6 | Tokai Communications | 3.56 | 3.53 | No change |
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| 7 | So-net | 3.52 | 3.51 | No change |
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| 8 | OCN (NTT Com) | 3.51 | 3.50 | No change |
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| 9 | J:COM | 3.49 | 3.48 | No change |
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| 10 | Asahi Net | 3.41 | 3.39 | No change |
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| 11 | IIJ | 3.37 | 3.39 | No change |
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| 12 | BIGLOBE | 3.26 | 3.25 | No change |
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| 13 | NIFTY | 3.24 | 3.15 | No change |
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| 14 | KDDI Cable/DSL/Wireless | 3.08 | 3.09 | No change |
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| 15 | VECTANT | 2.95 | 2.83 | +1 |
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| 16 | NTTPC InfoSphere | 2.92 | 2.91 | -1 |
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| 17 | Softbank - DSL | 2.77 | 2.76 | No change |
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| 18 | Freebit | 2.70 | 2.62 | No change |
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