A list of all Japan ASNs including hosting providers, ISPs, and businesses with announced IPv4 and IPv6 prefixes.
| ASN | Type | IPv4 Routes | IPv6 Routes | Company |
|---|---|---|---|---|
| AS4723 | Other Business | 5 | 0 | Dolphin |
| AS58652 | Education | 5 | 0 | Kochi University |
| AS63775 | Other Business | 5 | 0 | YAKAGE CABLE TELEVISION |
| AS151388 | Other Business | 4 | 4 | SoftEther Corporation (SE-JIKKEN-AS) |
| AS37900 | ISP & Mobile | 4 | 3 | NTT Communications Corporation |
| AS55907 | Other Business | 4 | 3 | GMO Internet, Inc. |
| AS18087 | Education | 4 | 2 | Toyo University |
| AS2501 | Education | 4 | 2 | The University of Tokyo |
| AS55912 | Education | 4 | 2 | University of Kochi |
| AS10012 | ISP & Mobile | 4 | 1 | Rakuten Mobile, Inc. |
| AS131900 | Hosting Provider | 4 | 1 | Directorz Co.,Ltd. |
| AS138033 | Other Business | 4 | 1 | BBIX, Inc |
| AS142165 | Other Business | 4 | 1 | Bosch Corporation |
| AS146976 | Other Business | 4 | 1 | Kvision Co.,Ltd. |
| AS17530 | Other Business | 4 | 1 | Nihon Network Service Co, .Ltd. |
| AS17683 | ISP & Mobile | 4 | 1 | Wingtechnology Communications, Inc. |
| AS17693 | Other Business | 4 | 1 | YAMATO SYSTEM DEVELOPMENT CO., LTD. |
| AS23805 | Other Business | 4 | 1 | Watarase Television Co.,Ltd |
| AS23827 | ISP & Mobile | 4 | 1 | Azumino Network Community TV |
| AS24229 | Other Business | 4 | 1 | IX-layers, Inc. |
| AS24277 | ISP & Mobile | 4 | 1 | Okinawa Cable Network Co.,Ltd |
| AS24289 | ISP & Mobile | 4 | 1 | Kagawa T.V Broadcast Network Co,.Ltd |
| AS24572 | Other Business | 4 | 1 | Yahoo Japan |
| AS2515 | Other Business | 4 | 1 | Japan Network Information Center |
| AS45677 | ISP & Mobile | 4 | 1 | Isahaya Cable Media Co.,Ltd |
| AS7505 | Other Business | 4 | 1 | Fujitsu Systems Applications & Support Limited |
| AS9357 | Other Business | 4 | 1 | NRI SecureTechnologies, Ltd. |
| AS131907 | ISP & Mobile | 4 | 0 | Iwami Cablevision Co.,Ltd. |
| AS131926 | Other Business | 4 | 0 | Cable Television Saiki Co. , Ltd. |
| AS131928 | Other Business | 4 | 0 | Tottori Teletopia Co., Ltd. |
| AS131943 | Other Business | 4 | 0 | Goto tv |
| AS134534 | ISP & Mobile | 4 | 0 | AT&T Japan K.K. |
| AS134536 | ISP & Mobile | 4 | 0 | AT&T Japan K.K. |
| AS152868 | Other Business | 4 | 0 | THX Corp. |
| AS17685 | Other Business | 4 | 0 | SQUARE ENIX CO., LTD. |
| AS17940 | Other Business | 4 | 0 | CYBERLINKS CO.,LTD. |
| AS18264 | Other Business | 4 | 0 | Seikei Eizo Network Inc. |
| AS23781 | Education | 4 | 0 | Toyama University |
| AS23799 | Government | 4 | 0 | National Defence Academy |
| AS23808 | ISP & Mobile | 4 | 0 | TOSHIMA CABLE NETWORK CO.,LTD |
| AS24286 | Other Business | 4 | 0 | Weathernews,Inc. |
| AS24291 | Other Business | 4 | 0 | MITSUI & CO., LTD. |
| AS24296 | Other Business | 4 | 0 | LY Corporation |
| AS2504 | Education | 4 | 0 | Kyoto University |
| AS2505 | Education | 4 | 0 | High Energy Accelerator Research Organization, KEK |
| AS38634 | Other Business | 4 | 0 | DWANGO Co.,Ltd. |
| AS401474 | Other Business | 4 | 0 | ENXO LLC |
| AS4774 | ISP & Mobile | 4 | 0 | Internet Initiative Japan, Inc. |
| AS55376 | ISP & Mobile | 4 | 0 | KCV communications CO.,LTD. |
| AS55393 | Other Business | 4 | 0 | Midokura Japan K.K. |
| AS59118 | Other Business | 4 | 0 | NRI SecureTechnologies, Ltd. |
| AS63772 | ISP & Mobile | 4 | 0 | extride inc. |
| AS63801 | ISP & Mobile | 4 | 0 | DODO K.K. |
| AS51044 | Other Business | 3 | 18 | Kazuki Yamaguchi |
| AS131969 | Hosting Provider | 3 | 3 | Suzuyo Shinwart Corporation |
| AS146981 | Hosting Provider | 3 | 3 | Nekojarashi Inc. |
| AS152858 | Other Business | 3 | 3 | Woven by Toyota, Inc. |
| AS55379 | Education | 3 | 3 | Hosei University |
| AS17509 | Other Business | 3 | 2 | STARNET Co.,Ltd. |
| AS18149 | Other Business | 3 | 2 | Japan Registry Service Co., Ltd. |
| AS38074 | Other Business | 3 | 2 | Ayao Takata |
| AS4717 | Education | 3 | 2 | WIDE Project |
| AS7503 | ISP & Mobile | 3 | 2 | Air Internet Service Co.,Ltd. |
| AS131905 | Other Business | 3 | 1 | Japan Registry Services Co., Ltd. |
| AS131910 | Other Business | 3 | 1 | SORACOM. INC. |
| AS131929 | ISP & Mobile | 3 | 1 | Yamanashi CATV Co,. ltd |
| AS131949 | Other Business | 3 | 1 | General Incorporated Foundation Aso Telework Center |
| AS131986 | Other Business | 3 | 1 | ITOCHU Cable Systems Corp. |
| AS151374 | Other Business | 3 | 1 | IX-layers, Inc. |
| AS152645 | Other Business | 3 | 1 | Flextech Inc. |
| AS17701 | Education | 3 | 1 | Seinan Gakuin University |
| AS17937 | Other Business | 3 | 1 | NIKKEI ADVANCED SYSTEMS INC. |
| AS17948 | Other Business | 3 | 1 | EditNet, Inc. |
| AS18266 | Other Business | 3 | 1 | Datacore Works Co.,Ltd. |
| AS23616 | Other Business | 3 | 1 | Hitachi Systems, Ltd. |
| AS23720 | ISP & Mobile | 3 | 1 | Rakuten Mobile, Inc. |
| AS24270 | Other Business | 3 | 1 | ITOCHU Techno-Solutions Corporation |
| AS24278 | Other Business | 3 | 1 | USEN CORPORATION |
| AS2500 | Education | 3 | 1 | WIDE Project |
| AS2523 | Education | 3 | 1 | Internet Technology Research Consortium |
| AS37904 | Other Business | 3 | 1 | BBIX, Inc. |
| AS4678 | Other Business | 3 | 1 | Canon IT Solutions Inc. |
| AS55390 | Education | 3 | 1 | Tokyo University of Science |
| AS55904 | Education | 3 | 1 | KOGAKUIN University |
| AS55909 | Education | 3 | 1 | National Institute of Technology, Kochi College |
| AS63776 | Other Business | 3 | 1 | Mercari, Inc. |
| AS63782 | ISP & Mobile | 3 | 1 | Omaezaki Cable Television Co.Ltd |
| AS63799 | Other Business | 3 | 1 | Ghost Network |
| AS7500 | Education | 3 | 1 | WIDE Project |
| AS7530 | Hosting Provider | 3 | 1 | BroadBand Tower, Inc. |
| AS7674 | ISP & Mobile | 3 | 1 | NTT DOCOMO BUSINESS, Inc |
| AS10015 | Other Business | 3 | 0 | Cyber Wave Japan Co., Ltd. |
| AS10209 | Other Business | 3 | 0 | Synopsys |
| AS131077 | Other Business | 3 | 0 | Deloitte Tohmatsu Group LLC |
| AS131901 | Other Business | 3 | 0 | FIDESSA KK |
| AS131909 | Other Business | 3 | 0 | OCC Co., Ltd. |
| AS131919 | Education | 3 | 0 | Meiji University |
| AS131940 | Other Business | 3 | 0 | Nissho Electronics Corp. |
| AS131946 | Education | 3 | 0 | MUSASHINO UNIVERSITY E.F. |
| AS131953 | ISP & Mobile | 3 | 0 | NPO Yutopianet |