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 |
|---|---|---|---|---|
| AS131955 | Other Business | 3 | 0 | Kyoutou Cable Net Co Ltd |
| AS131961 | Education | 3 | 0 | Dokkyo University |
| AS136586 | Other Business | 3 | 0 | InComm Japan K.K. |
| AS146987 | Other Business | 3 | 0 | GMO GlobalSign Holdings K.K. |
| AS150358 | Education | 3 | 0 | Tokyo Woman's Christian University |
| AS150363 | Other Business | 3 | 0 | SoftEther Corporation |
| AS151375 | Other Business | 3 | 0 | HimawariTV.Corporation |
| AS151387 | ISP & Mobile | 3 | 0 | OMURA CABLE TELEVISION K.K. |
| AS17512 | Other Business | 3 | 0 | Japan Airlines Co., Ltd. |
| AS17687 | Education | 3 | 0 | Nagoya University |
| AS17694 | Other Business | 3 | 0 | Deutsche Bank Group, Japan BGP connection |
| AS18091 | Education | 3 | 0 | Teikyo University |
| AS212259 | Other Business | 3 | 0 | Astrix Co., Ltd. |
| AS23785 | Hosting Provider | 3 | 0 | RYOMO INTERNET DATACENTER Co.,Ltd |
| AS23817 | Other Business | 3 | 0 | Fujitsu Limited. |
| AS23824 | Hosting Provider | 3 | 0 | Future Spirits Co.,Ltd. |
| AS23826 | Education | 3 | 0 | Daido University |
| AS24261 | Education | 3 | 0 | Mie University |
| AS24263 | Other Business | 3 | 0 | HONDA MOTOR Co., Ltd. |
| AS24283 | Hosting Provider | 3 | 0 | MIEDEN SYSTEM SOLUTION .LTD |
| AS37888 | Other Business | 3 | 0 | HORIBA, Ltd. |
| AS37889 | Other Business | 3 | 0 | J-PARC Center |
| AS37907 | Hosting Provider | 3 | 0 | DigiRock, Inc. |
| AS37916 | Other Business | 3 | 0 | A.T.WORKS, Inc. |
| AS37917 | Education | 3 | 0 | University of Tsukuba |
| AS38633 | Hosting Provider | 3 | 0 | Value Core Inc. |
| AS38641 | Education | 3 | 0 | Osaka Sangyo University |
| AS38643 | Other Business | 3 | 0 | UNIADEX, LTD. |
| AS45675 | ISP & Mobile | 3 | 0 | JCOM Co., Ltd. |
| AS58788 | Hosting Provider | 3 | 0 | Chiroro-Net Co.,Ltd. |
| AS59097 | Other Business | 3 | 0 | Okinawa Cross Head Co., Ltd. |
| AS59104 | Education | 3 | 0 | Soka University |
| AS59121 | Other Business | 3 | 0 | Asahi Kasei Networks Corporation |
| AS59129 | ISP & Mobile | 3 | 0 | LogicLinks, Inc. |
| AS59248 | Other Business | 3 | 0 | ROCKWELL AUTOMATION BV |
| AS63783 | Education | 3 | 0 | Chiba University of Commerce |
| AS63789 | Hosting Provider | 3 | 0 | NeXtWEB Corporation |
| AS7509 | Other Business | 3 | 0 | Hokkaido University |
| AS9604 | Other Business | 3 | 0 | FUJI SOFT INCORPORATED |
| AS63800 | Hosting Provider | 2 | 10 | SERVER-G Group |
| AS55911 | Other Business | 2 | 6 | kazukichi |
| AS58790 | Hosting Provider | 2 | 6 | SERVER-G Group |
| AS63806 | Education | 2 | 4 | Human-life Information Platforms Institute |
| AS38636 | Other Business | 2 | 3 | DeNA, Co. Ltd. |
| AS63785 | Education | 2 | 3 | Fukuoka University |
| AS7667 | Other Business | 2 | 3 | KDDI R&D Laboratories, INC. |
| AS142052 | Other Business | 2 | 2 | Mempool Space K.K. |
| AS150369 | ISP & Mobile | 2 | 2 | TelHi Corporation |
| AS152877 | Other Business | 2 | 2 | Nintendo Co., Ltd |
| AS17523 | Education | 2 | 2 | Aoyama Gakuin University |
| AS38635 | Education | 2 | 2 | Keio University |
| AS63773 | Other Business | 2 | 2 | dual&Co. Inc. |
| AS63797 | Other Business | 2 | 2 | CuteIP |
| AS63798 | Other Business | 2 | 2 | Industrial Cyber Security Center of Excellence |
| AS7660 | Education | 2 | 2 | Asia Pacific Advanced Network - Japan |
| AS131158 | Education | 2 | 1 | Nara Institute of Science and Technology, National University Corporation |
| AS131912 | Other Business | 2 | 1 | Cybozu,Inc. |
| AS131970 | ISP & Mobile | 2 | 1 | Hikarinet Inc. |
| AS131982 | ISP & Mobile | 2 | 1 | Uenohara Broadband Communications Inc. |
| AS131987 | Hosting Provider | 2 | 1 | MC Digital Realty, Inc. |
| AS153929 | ISP & Mobile | 2 | 1 | Allied Business Inc. |
| AS17678 | ISP & Mobile | 2 | 1 | Gunma Internet Co,.ltd |
| AS17932 | Education | 2 | 1 | Japan Advanced Institute of Science and Technology |
| AS18123 | Education | 2 | 1 | INAOKI EDUCATIONAL INSTITUTION |
| AS18267 | Education | 2 | 1 | Doshisha University |
| AS23628 | ISP & Mobile | 2 | 1 | Academic newtown Community Cable Service |
| AS23631 | Other Business | 2 | 1 | Sofu System, Inc |
| AS23641 | Other Business | 2 | 1 | NS Computer Service Corporation |
| AS23776 | Other Business | 2 | 1 | NEC Corporation |
| AS23836 | Other Business | 2 | 1 | RELATION Co., Ltd. |
| AS24253 | Hosting Provider | 2 | 1 | J-Stream Inc. |
| AS37897 | Hosting Provider | 2 | 1 | AXEL NETWORKS, INC. |
| AS37919 | Other Business | 2 | 1 | SEGA SAMMY HOLDINGS INC. |
| AS38656 | Other Business | 2 | 1 | Loutres |
| AS45689 | Education | 2 | 1 | Convivial Net |
| AS55388 | Hosting Provider | 2 | 1 | ASJ INC. |
| AS59093 | Other Business | 2 | 1 | IMABARI CATV CORPORATION |
| AS63781 | ISP & Mobile | 2 | 1 | Kobayashi Family Net LLP |
| AS7257 | Other Business | 2 | 1 | OTO GK |
| AS7527 | Hosting Provider | 2 | 1 | Japan Internet Xing Co., Ltd. |
| AS7664 | ISP & Mobile | 2 | 1 | HARENET INC. |
| AS7665 | Government | 2 | 1 | Okayama Prefectural Government |
| AS9355 | Government | 2 | 1 | National Institute of Information and Communications Technology |
| AS9367 | Education | 2 | 1 | Institute of Science Tokyo |
| AS9618 | ISP & Mobile | 2 | 1 | Tokyo Cable Network.,Inc. |
| AS131902 | ISP & Mobile | 2 | 0 | LogicLinks, Inc. |
| AS131966 | Hosting Provider | 2 | 0 | I-NET CORP. |
| AS137819 | Hosting Provider | 2 | 0 | Beeks Financial Cloud (Japan) |
| AS139255 | Other Business | 2 | 0 | U-NEXT Co.,Ltd. |
| AS150366 | Other Business | 2 | 0 | demae-can co. ltd |
| AS151380 | Other Business | 2 | 0 | Transform Co., Ltd. |
| AS173 | ISP & Mobile | 2 | 0 | Nippon Telegraph and Telephone Corporation |
| AS17680 | Other Business | 2 | 0 | SCSK Corporation |
| AS17941 | Hosting Provider | 2 | 0 | Equinix Japan Enterprise K.K. |
| AS17947 | Other Business | 2 | 0 | SAKURA KCS Corporation. |
| AS17950 | ISP & Mobile | 2 | 0 | SaiNet |
| AS17977 | ISP & Mobile | 2 | 0 | Singapore Telecom Japan Ltd |
| AS18088 | ISP & Mobile | 2 | 0 | QTnet,Inc. |
| AS18090 | Other Business | 2 | 0 | IMS Corporation |
| AS18142 | Other Business | 2 | 0 | KISTEM Co., Ltd. |