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 |
|---|---|---|---|---|
| AS63795 | Education | 1 | 1 | RoutelNet |
| AS9609 | Other Business | 1 | 1 | BBIX, Inc. |
| AS9991 | Education | 1 | 1 | Hiroshima Shudo University |
| AS10016 | Other Business | 1 | 0 | Minaminihon Information Processing Center Co Ltd |
| AS131894 | Other Business | 1 | 0 | UNIADEX, LTD. |
| AS131897 | Education | 1 | 0 | National University Corporation ,Ehime University |
| AS131903 | Other Business | 1 | 0 | Nomura Research Institute,Ltd. |
| AS131930 | Other Business | 1 | 0 | Tokyo Broadcasting System Television, Inc. |
| AS131938 | Other Business | 1 | 0 | NISSAN MOTOR CO.,LTD. |
| AS131942 | Other Business | 1 | 0 | Gurunavi, Inc. |
| AS131945 | Other Business | 1 | 0 | Sanntuu Corporation |
| AS131977 | Other Business | 1 | 0 | Japan Photo Finish Corporation |
| AS131983 | Other Business | 1 | 0 | suo cablenet corporation |
| AS131989 | Other Business | 1 | 0 | PFU LIMITED |
| AS132504 | Other Business | 1 | 0 | QUALITIA Co.,LTD |
| AS133180 | Other Business | 1 | 0 | Starbow Ltd. |
| AS133476 | Other Business | 1 | 0 | First Innovation K.K. |
| AS134530 | ISP & Mobile | 1 | 0 | AT&T Japan K.K. |
| AS134533 | ISP & Mobile | 1 | 0 | AT&T Japan K.K. |
| AS134827 | Other Business | 1 | 0 | EY Japan Co., Ltd. |
| AS135372 | Other Business | 1 | 0 | Columbia Sportswear Japan Inc |
| AS140501 | Other Business | 1 | 0 | Itiviti Japan K.K. |
| AS141694 | ISP & Mobile | 1 | 0 | Ermis Ltd. |
| AS146982 | Other Business | 1 | 0 | Shinnyo-en |
| AS146985 | Other Business | 1 | 0 | KISSEI COMTEC Co.,Ltd |
| AS147295 | Other Business | 1 | 0 | Metro Engines Inc |
| AS148985 | Other Business | 1 | 0 | ANSYS Japan K.K. |
| AS150356 | Other Business | 1 | 0 | GMO BRAND SECURITY Inc. |
| AS151376 | Other Business | 1 | 0 | Solare Hotels and Resorts Co., Ltd. |
| AS151377 | Other Business | 1 | 0 | Solare Hotels and Resorts Co., Ltd. |
| AS151378 | Other Business | 1 | 0 | Credit SAISON Co., Ltd. |
| AS151379 | Other Business | 1 | 0 | NHN Cloud Japan Corporation |
| AS151383 | Hosting Provider | 1 | 0 | EZSVS Japan Co., Ltd. |
| AS151385 | Other Business | 1 | 0 | Japanet Holdings Co.,Ltd. |
| AS151390 | Hosting Provider | 1 | 0 | RUTILEA, Inc. |
| AS152859 | Other Business | 1 | 0 | UNIADEX, LTD. |
| AS152861 | Education | 1 | 0 | Chiba Institute of Technology |
| AS152869 | Other Business | 1 | 0 | ICJ, Inc. |
| AS152874 | Education | 1 | 0 | JONET |
| AS17510 | Other Business | 1 | 0 | INFORMATION SERVICES INTERNATIONAL - DENTSU, LTD. |
| AS17518 | Government | 1 | 0 | Shiojiri City |
| AS17699 | ISP & Mobile | 1 | 0 | ARTERIA Networks Corporation |
| AS17905 | Other Business | 1 | 0 | Dresdner Kleinwort Wasserstein Ltd |
| AS17946 | Education | 1 | 0 | Gifu University |
| AS17956 | Other Business | 1 | 0 | WASEDA University |
| AS17960 | Education | 1 | 0 | University of the Ryukyus |
| AS18069 | Other Business | 1 | 0 | SB Technology Corp. |
| AS18076 | Education | 1 | 0 | Institute of Advanced Media Arts and Sciences |
| AS18125 | Other Business | 1 | 0 | Ministry of Agriculture, Forestry and Fisheries Research Network |
| AS18128 | Education | 1 | 0 | RIKEN |
| AS18140 | Other Business | 1 | 0 | LY Corporation |
| AS18141 | Other Business | 1 | 0 | HBA Corporation |
| AS18143 | Other Business | 1 | 0 | Mitsubishi Research Institute DCS Co.,Ltd. |
| AS18263 | Hosting Provider | 1 | 0 | MEITETSUCOM Co., Ltd. |
| AS18276 | Education | 1 | 0 | Kansai University |
| AS18279 | Other Business | 1 | 0 | Bukkyo University |
| AS18289 | ISP & Mobile | 1 | 0 | AT&T Japan K.K. |
| AS18383 | Other Business | 1 | 0 | CAHI Corporation |
| AS23615 | Education | 1 | 0 | University of Shizuoka |
| AS23623 | Education | 1 | 0 | Chuo University |
| AS23633 | ISP & Mobile | 1 | 0 | Niigata Communication Service |
| AS23761 | Other Business | 1 | 0 | Xpedite Systems |
| AS23773 | Other Business | 1 | 0 | EKZM co.,ltd. |
| AS23798 | Other Business | 1 | 0 | VR Techno Center,inc |
| AS23804 | ISP & Mobile | 1 | 0 | Nonprofit Organization Kitaura Hana Net |
| AS23807 | Education | 1 | 0 | Ritsumeikan University |
| AS23833 | Other Business | 1 | 0 | Marusan Securities Co., LTD. |
| AS24248 | Education | 1 | 0 | Wakayama University |
| AS24250 | Other Business | 1 | 0 | Miyagin Digital Solutions Co.,Ltd. |
| AS24254 | Education | 1 | 0 | Kyoto Sangyo University |
| AS24260 | Education | 1 | 0 | Board of trusty: Kinjo-Gakuen |
| AS24264 | Education | 1 | 0 | Kanazawa Institute of Technology |
| AS24268 | Education | 1 | 0 | National University Corporation Shizuoka University |
| AS24275 | Other Business | 1 | 0 | TOTO LTD. |
| AS24290 | ISP & Mobile | 1 | 0 | Heart Network Co.,LTD |
| AS24509 | Other Business | 1 | 0 | Xpedite Systems |
| AS24512 | Other Business | 1 | 0 | Will Ltd. |
| AS2508 | Education | 1 | 0 | Kyushu University |
| AS2513 | Government | 1 | 0 | Japan Science and Technology Agency |
| AS37898 | Other Business | 1 | 0 | digitiminimi, inc. |
| AS37905 | Other Business | 1 | 0 | Brastel Co.,Ltd |
| AS37910 | Education | 1 | 0 | Chubu University |
| AS37915 | Government | 1 | 0 | Wakayama Prefectural Government |
| AS38642 | Hosting Provider | 1 | 0 | Yoshizou XYZ Solutions |
| AS38649 | Education | 1 | 0 | The University of Electro-Communications |
| AS45672 | ISP & Mobile | 1 | 0 | Koga Cable TV Co., Ltd. |
| AS45678 | Other Business | 1 | 0 | ABN AMRO Clearing Tokyo Co., Ltd. |
| AS45685 | Education | 1 | 0 | Rikkyo Gakuin Rikkyo University |
| AS45690 | Other Business | 1 | 0 | Tokushima Central TV Co.,Inc. |
| AS55373 | Government | 1 | 0 | Foundation for Biomedical Research and Innovation |
| AS55378 | Other Business | 1 | 0 | QUICK Corp. |
| AS55380 | Education | 1 | 0 | Kanazawa University |
| AS55382 | Government | 1 | 0 | Nagato city office |
| AS55890 | Other Business | 1 | 0 | Suntory Business Systems Ltd. |
| AS55894 | Other Business | 1 | 0 | Who's Next |
| AS55949 | Other Business | 1 | 0 | Technopro Holdings |
| AS58784 | Education | 1 | 0 | Rissho University |
| AS59091 | Education | 1 | 0 | Kanagawa Institute of Technology |
| AS59095 | Other Business | 1 | 0 | ACCELIA |
| AS59120 | ISP & Mobile | 1 | 0 | Tsukuba Internet Service Corporation |