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 - May 2019
| Rank | ISP | Speed Mbps | Previous Mbps | Rank Change | Type | |
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| 1 | au Hikari (KDDI) | 4.24 | 4.29 | No change |
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| 2 | Softbank - Fiber | 3.91 | 3.99 | No change |
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| 3 | eo Hikari (K-Opticom) | 3.76 | 3.79 | No change |
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| 4 | UCOM | 3.69 | 3.71 | No change |
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| 5 | So-net | 3.53 | 3.60 | No change |
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| 6 | iTSCOM | 3.52 | 3.60 | No change |
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| 7 | Tokai Communications | 3.51 | 3.58 | No change |
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| 8 | OCN (NTT Com) | 3.48 | 3.53 | No change |
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| 9 | IIJ | 3.43 | 3.49 | No change |
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| 10 | J:COM | 3.38 | 3.45 | No change |
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| 11 | Asahi Net | 3.30 | 3.32 | No change |
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| 12 | BIGLOBE | 3.17 | 3.25 | No change |
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| 13 | VECTANT | 3.13 | 3.23 | No change |
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| 14 | NIFTY | 2.86 | 2.91 | No change |
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| 15 | KDDI Cable/DSL/Wireless | 2.74 | 2.79 | No change |
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| 16 | NTTPC InfoSphere | 2.61 | 2.63 | No change |
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| 17 | Softbank - DSL | 2.23 | 2.24 | +1 |
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| 18 | Freebit | 2.16 | 2.26 | -1 |
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