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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
PeeringDB-registered presence.
APNIC-measured end-user deployment.
Clean prefixes (valid RPKI + IRR, no mismatch).
Cumulative IPv4, IPv6, and ASN allocations to Japan over time.
The largest autonomous systems registered to Japan by IPv4 footprint.
Share of announced address space covered by valid Route Origin Authorizations.
1,297 autonomous systems registered to Japan. Click an AS for detail.
| 669 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
| 217.1K |
| 65.5K |
| 16 |
| AS2522JP | PPP-EXP - Japan Network Information Center | 229.1K | — | 15 |
| AS9351JP | ZLAN - ZTV CO.,LTD | 249.9K | 65.5K | 31 |
| AS4673JP | INTERVIA - NTT DATA CORPORATION | 251.1K | 69.6K | 29 |
| AS7506JP | GMO-I-R1 - GMO Internet, Inc. | 267.5K | 4.1K | 53 |
| AS18144JP | AS-ENECOM - Enecom,Inc. | 291.8K | 524.3K | 23 |
| AS9371JP | SAKURA-C - SAKURA Internet Inc. | 306.7K | 65.5K | 23 |
| AS9597JP | CPI-NET - KDDI Web Communications Inc. | 317.7K | 65.5K | 27 |
| AS9370JP | SAKURA-B - SAKURA Internet Inc. | 341.2K | 1M | 44 |
| AS7684JP | SAKURA-A - SAKURA Internet Inc. | 368.6K | 65.5K | 52 |
| AS9365JP | iTSCOM - its communications Inc. | 404.5K | 65.5K | 15 |
| AS138384JP | RMNI-AS-AP - Rakuten Mobile Network, Inc. | 420.9K | 16.8M | 32 |
| AS18077JP | C-able - Yamaguchi Cable Vision Co.,Ltd | 449.3K | 65.5K | 55 |
| AS7671JP | MCNET - NTT SmartConnect Corporation | 457.7K | 327.7K | 63 |
| AS18071JP | MEI1 - Panasonic Information Systems Co., Ltd | 514.3K | — | 16 |
| AS7522JP | STCN - STNet, Incorporated | 594.9K | 65.5K | 55 |
| AS131932JP | JEIS-NET - JR East Information Systems Company | 655.4K | — | 71 |
| AS7687JP | D-CRUISENET - TOYOTA SYSTEMS CORPORATION | 661.8K | — | 211 |
| AS7524JP | HANSHIN - ITEC HANKYU HANSHIN CO.,LTD. | 684.3K | 65.5K | 122 |
| AS7679JP | QTNET - QTnet,Inc. | 760.8K | 65.5K | 37 |
| AS18081JP | KCN - Kintetsu Cable Network Co., Ltd. | 868.4K | 65.5K | 39 |
| AS4721JP | JCN - JCOM Co., Ltd. | 1.3M | 65.5K | 163 |
| AS4685JP | ASAHI-NET - Asahi Net | 1.3M | 589.8K | 64 |
| AS18126JP | CTCX - Chubu Telecommunications Company, Inc. | 1.4M | 131.1K | 62 |
| AS2519JP | VECTANT - ARTERIA Networks Corporation | 1.5M | 1.6M | 184 |
| AS2510JP | INFOWEB - FUJITSU LIMITED | 1.6M | 65.5K | 62 |
| AS9595JP | XEPHION - NTT-ME Corporation | 1.6M | 67.3M | 49 |
| AS10010JP | TOKAI - TOKAI Communications Corporation | 1.6M | 688.1K | 193 |
| AS4694JP | IDCF - IDC Frontier Inc. | 1.9M | 262.1K | 332 |
| AS4725JP | ODN - SoftBank Corp. | 1.9M | 65.5K | 139 |
| AS10013JP | FBDC - FreeBit Co.,Ltd. | 2M | 131.1K | 410 |
| AS9617JP | ZAQ - JCOM Co., Ltd. | 2.3M | 131.1K | 118 |
| AS9605JP | docomo - NTT DOCOMO, INC. | 2.6M | 186.2K | 1,254 |
| AS2514JP | InfoSphere - NTT PC Communications, Inc. | 2.6M | 204.8K | 472 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 65.5K | 67 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 589.8K | 36 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 2.2M | 76 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 270.3K | 205 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 65.5K | 41 |
| AS2907JP | SINET-AS - Research Organization of Information and Systems, National Institute of Informatics | 9M | 131.1K | 669 |
| AS9824JP | JTCL-JP-AS - JCOM Co., Ltd. | 10.3M | 1.1M | 293 |
| AS2516JP | KDDI - KDDI CORPORATION | 18.2M | 42.1M | 570 |
| AS4713JP | OCN - NTT DOCOMO BUSINESS,Inc. | 28.6M | 67.2M | 186 |
| AS17676JP | GIGAINFRA - SoftBank Corp. | 48.4M | 285.3M | 466 |