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 |
|---|---|---|---|---|
| AS55383 | Other Business | 8 | 0 | YYY Group, Inc. |
| AS17953 | Other Business | 7 | 7 | BroadBand Security, Inc |
| AS139358 | Hosting Provider | 7 | 3 | Kansuiun Co., Ltd |
| AS9601 | ISP & Mobile | 7 | 3 | Niigata Communication Service |
| AS134537 | ISP & Mobile | 7 | 2 | AT&T Japan K.K. |
| AS55394 | Other Business | 7 | 2 | GREE, Inc. |
| AS10011 | Other Business | 7 | 1 | advanscope inc. |
| AS17958 | ISP & Mobile | 7 | 1 | Kasaoka Cable Vision LIMITED |
| AS23627 | ISP & Mobile | 7 | 1 | UEDA CABLE VISION CO.,LTD. |
| AS23816 | Other Business | 7 | 1 | LY Corporation |
| AS23831 | ISP & Mobile | 7 | 1 | NISHIOWARI CATV CORPORATION |
| AS24255 | Other Business | 7 | 1 | Tannan Cable Television Corporation |
| AS24282 | Hosting Provider | 7 | 1 | KAGOYA JAPAN Inc. |
| AS4675 | Other Business | 7 | 1 | UNIADEX, LTD. |
| AS4693 | Other Business | 7 | 1 | CSK-IT MANAGEMENT CORPORATION |
| AS4697 | Other Business | 7 | 1 | NTT Software Innovation Center |
| AS131915 | ISP & Mobile | 7 | 0 | Hamamatsu Cable Television .Inc |
| AS131917 | Other Business | 7 | 0 | Toshiba I.S. corp |
| AS152871 | Other Business | 7 | 0 | TAIYO NIPPON SANSO CORPORATION |
| AS17691 | Other Business | 7 | 0 | NDS CO., LTD. |
| AS18150 | ISP & Mobile | 7 | 0 | NetComBB Co.,Ltd. |
| AS23967 | Other Business | 7 | 0 | Produce On Demand, Inc. |
| AS45688 | Education | 7 | 0 | The University of Tokyo Interfaculty Initiative in Information Studies |
| AS58648 | Other Business | 7 | 0 | AT-I, Inc. |
| AS58653 | Other Business | 7 | 0 | UD Trucks Corporation, Volvo Information Technology Japan |
| AS59102 | Other Business | 7 | 0 | GENES Co., Ltd. |
| AS7502 | Government | 7 | 0 | Advanced Software Technology & Management Research Institute of KYOTO |
| AS54415 | Other Business | 6 | 7 | WIZ K.K. |
| AS131161 | Other Business | 6 | 3 | NEC Corporation |
| AS133458 | Other Business | 6 | 2 | FPT Smart Cloud Japan Co., Ltd |
| AS18259 | ISP & Mobile | 6 | 2 | NTT Communications Corporation |
| AS55899 | Other Business | 6 | 2 | irob Ltd. |
| AS10002 | ISP & Mobile | 6 | 1 | IGAUENO CABLE TELEVISION CO.,LTD |
| AS131159 | Education | 6 | 1 | Yamagata University |
| AS131958 | Other Business | 6 | 1 | Tama Cable Network Co.,Ltd. |
| AS141757 | Other Business | 6 | 1 | Zoho Japan Corporation |
| AS146969 | Other Business | 6 | 1 | SB Technology Corp. |
| AS17934 | Government | 6 | 1 | National Institute of Information and Communications Technology |
| AS18121 | Other Business | 6 | 1 | Ishikawa Computer Center Co.,LTD |
| AS18139 | Other Business | 6 | 1 | Hitachi Solutions, Ltd. |
| AS23620 | ISP & Mobile | 6 | 1 | DMM.com LLC |
| AS23791 | ISP & Mobile | 6 | 1 | LCV Corporation |
| AS37892 | ISP & Mobile | 6 | 1 | Cable Media WAIWAI Co.,Ltd. |
| AS37908 | Other Business | 6 | 1 | KIBI Cable Television Co.,Ltd. |
| AS37922 | ISP & Mobile | 6 | 1 | Diversitymedia Co.,Ltd. |
| AS38462 | Hosting Provider | 6 | 1 | Osaki Computer Engineering Co.Ltd |
| AS45680 | Other Business | 6 | 1 | DOVA Corporation |
| AS45687 | ISP & Mobile | 6 | 1 | Minamikyusyu CableTV Net Inc. |
| AS7682 | ISP & Mobile | 6 | 1 | HOKKAIDO TELECOMMUNICATIONS NETWORK Co., Inc. |
| AS131904 | Other Business | 6 | 0 | Cyber Feel Inc |
| AS131931 | ISP & Mobile | 6 | 0 | Aomori Cable TV Co., Ltd. |
| AS131941 | ISP & Mobile | 6 | 0 | Entsu Co.,Ltd. |
| AS131960 | Other Business | 6 | 0 | MBO holdings Inc. |
| AS131981 | Education | 6 | 0 | Takushoku University |
| AS150367 | Other Business | 6 | 0 | Future Corp. |
| AS17957 | ISP & Mobile | 6 | 0 | SOUTH TOKYO CABLETELEVISION |
| AS18094 | ISP & Mobile | 6 | 0 | Tokyo Cable Network.,INC |
| AS18258 | Other Business | 6 | 0 | Morgan Stanley Japan Group Co., Ltd. |
| AS18271 | Other Business | 6 | 0 | Sojitz Tech Innovation Co., Ltd. |
| AS23619 | Other Business | 6 | 0 | SMARTVALUE Co.,Ltd. |
| AS23795 | Other Business | 6 | 0 | FITEC Corporation |
| AS23818 | ISP & Mobile | 6 | 0 | JETINTERNET Corporation |
| AS24276 | ISP & Mobile | 6 | 0 | JCOM Co., Ltd. |
| AS55888 | Other Business | 6 | 0 | Nintatsu Global Telecommunications Corporation |
| AS59094 | Hosting Provider | 6 | 0 | esu2 Corporation |
| AS9366 | Other Business | 6 | 0 | SOLITON-NET |
| AS131971 | Other Business | 5 | 7 | Japan Network Information Center |
| AS24257 | Hosting Provider | 5 | 3 | Japan Internet Xing Co., Ltd. |
| AS38639 | Other Business | 5 | 2 | NTT DOCOMO BUSINESS, Inc. |
| AS55391 | ISP & Mobile | 5 | 2 | INTERNET MULTIFEED CO. |
| AS55392 | ISP & Mobile | 5 | 2 | INTERNET MULTIFEED CO. |
| AS131933 | ISP & Mobile | 5 | 1 | TAMA Television Co., Ltd |
| AS131954 | ISP & Mobile | 5 | 1 | Kawaguchiko cable television Inc |
| AS131957 | Other Business | 5 | 1 | MicroAd, Inc. |
| AS146979 | Education | 5 | 1 | University of Nagasaki |
| AS17689 | Hosting Provider | 5 | 1 | Hokuden Information Technology,Inc. |
| AS17936 | ISP & Mobile | 5 | 1 | Cable Television Kani Co.,Ltd. |
| AS17944 | Other Business | 5 | 1 | Japan Weather Association |
| AS18070 | Hosting Provider | 5 | 1 | Global Network Core Co.,Ltd. |
| AS18281 | ISP & Mobile | 5 | 1 | Chitahanto Cable Network Corp. |
| AS23618 | ISP & Mobile | 5 | 1 | Ibara Broadcasting Company |
| AS23775 | Other Business | 5 | 1 | tamatele-net |
| AS23780 | ISP & Mobile | 5 | 1 | CTB Media Inc. |
| AS23786 | ISP & Mobile | 5 | 1 | San-in Cable Vision CO.,LTD |
| AS2915 | Other Business | 5 | 1 | BBIX,Inc. |
| AS38651 | Other Business | 5 | 1 | Mixi,Inc. |
| AS55898 | Other Business | 5 | 1 | LY Corporation |
| AS59105 | ISP & Mobile | 5 | 1 | Home NOC Operators Group |
| AS59126 | ISP & Mobile | 5 | 1 | NCT CO.,LTD. |
| AS131914 | Other Business | 5 | 0 | Rakuten Group, Inc. |
| AS131939 | Other Business | 5 | 0 | IPS INC |
| AS131952 | Other Business | 5 | 0 | Asahikawa Cable Television Co., Ltd. |
| AS133203 | Other Business | 5 | 0 | SBI BITS Co., Ltd. |
| AS152875 | ISP & Mobile | 5 | 0 | MEEQ Inc. |
| AS18072 | ISP & Mobile | 5 | 0 | NTT Communications, Corp. |
| AS23614 | Other Business | 5 | 0 | Kochi Systems Co., Ltd. |
| AS23630 | ISP & Mobile | 5 | 0 | CAC Inc. |
| AS2511 | ISP & Mobile | 5 | 0 | Nippon Telegraph and Telephone Corporation |
| AS37893 | Other Business | 5 | 0 | Tradeweb Japan |
| AS38654 | Other Business | 5 | 0 | INES Corporation. |