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 |
|---|---|---|---|---|
| AS211252 | Hosting Provider | 2 | 0 | Marushin K.K. |
| AS23613 | ISP & Mobile | 2 | 0 | New Media Tokushima Co.,ltd. |
| AS23632 | Other Business | 2 | 0 | TVT Tsuyama Co.,Ltd. |
| AS23635 | Other Business | 2 | 0 | CRCCMedia Co.,ltd |
| AS23760 | Other Business | 2 | 0 | Xpedite Systems |
| AS23790 | ISP & Mobile | 2 | 0 | JCOM Co., Ltd. |
| AS23828 | Government | 2 | 0 | Misaki Town |
| AS24280 | Other Business | 2 | 0 | Hitachi Systems, Ltd. |
| AS37914 | Government | 2 | 0 | Advanced Software Technology and Management Research Institute of KYOTO |
| AS4729 | Government | 2 | 0 | Japan Atomic Energy Agency |
| AS4730 | Education | 2 | 0 | Osaka University |
| AS55387 | Other Business | 2 | 0 | Japan Communication Inc. |
| AS55396 | Other Business | 2 | 0 | NRI SecureTechnologies, Ltd |
| AS55897 | Hosting Provider | 2 | 0 | SAKURA Internet Inc. |
| AS59096 | Education | 2 | 0 | Meijigakuin University |
| AS59122 | Other Business | 2 | 0 | Ranger-Systems Co., Ltd. |
| AS63779 | Hosting Provider | 2 | 0 | InfiniCloud Co. Ltd. |
| AS7678 | Hosting Provider | 2 | 0 | PROX SYSTEM DESIGN INC. |
| AS7686 | ISP & Mobile | 2 | 0 | JCOM Co., Ltd. |
| AS9353 | Hosting Provider | 2 | 0 | MEDIAWARS co.,ltd. |
| AS9591 | Education | 2 | 0 | National Institute for Fusion Science |
| AS214675 | Other Business | 1 | 17 | Hidenori Matsuo |
| AS55891 | Other Business | 1 | 12 | WATCH TOWER BIBLE AND TRACT SOCIETY |
| AS152184 | Other Business | 1 | 10 | Tamukai Network |
| AS49867 | Other Business | 1 | 6 | Shuji Ito |
| AS150325 | Other Business | 1 | 4 | TSUKUDANI NETWORK |
| AS150368 | Hosting Provider | 1 | 3 | SERVER-G Group |
| AS63805 | Other Business | 1 | 3 | Ryobi Systems Co., Ltd. |
| AS146984 | ISP & Mobile | 1 | 2 | INTERNET MULTIFEED CO. |
| AS152873 | ISP & Mobile | 1 | 2 | Neodyland |
| AS214968 | Other Business | 1 | 2 | JIANG Zhirui |
| AS38215 | Other Business | 1 | 2 | Syuhei Uda |
| AS45679 | Other Business | 1 | 2 | Tatsumi, Tomo |
| AS59098 | Other Business | 1 | 2 | Mamireimu Net Work's |
| AS10014 | Education | 1 | 1 | Nihon University |
| AS131079 | ISP & Mobile | 1 | 1 | INTERNET MULTIFEED CO. |
| AS131156 | Other Business | 1 | 1 | LAC Co., Ltd. |
| AS131160 | ISP & Mobile | 1 | 1 | Wire and Wireless Co.,Ltd. |
| AS131895 | Education | 1 | 1 | Okinawa Institute of science and technology |
| AS131924 | Other Business | 1 | 1 | Kansai Airports |
| AS131948 | Other Business | 1 | 1 | FORNEXT Inc. |
| AS131951 | Hosting Provider | 1 | 1 | Suzuyo Shinwart Corporation |
| AS131963 | Hosting Provider | 1 | 1 | MC Digital Realty, Inc. |
| AS131964 | Other Business | 1 | 1 | FAMILYNET JAPAN CORPORATION |
| AS131976 | ISP & Mobile | 1 | 1 | INTERNET MULTIFEED CO. |
| AS131984 | Hosting Provider | 1 | 1 | JOCDN Inc. |
| AS131988 | ISP & Mobile | 1 | 1 | Takehara Cable Network Co,Ltd |
| AS132119 | Hosting Provider | 1 | 1 | TECPRESSO Inc. |
| AS133405 | ISP & Mobile | 1 | 1 | RETN Co., Ltd. |
| AS138652 | ISP & Mobile | 1 | 1 | Super Godzilla Communications GK |
| AS139472 | Other Business | 1 | 1 | Catalina Marketing Japan K.K. |
| AS146972 | Other Business | 1 | 1 | TOYO Engineering Corporation |
| AS146974 | Other Business | 1 | 1 | Woven by Toyota, Inc. |
| AS146980 | Education | 1 | 1 | Tokyo Metropolitan College of Industrial Technology Infomation System Engineering Course |
| AS146986 | Other Business | 1 | 1 | SUZUYO SHINWART CORPORATION |
| AS147035 | Other Business | 1 | 1 | Ching Kuo |
| AS150318 | Other Business | 1 | 1 | Tokyo Online Co.,Ltd. |
| AS150357 | Education | 1 | 1 | University of Nagasaki |
| AS150685 | Other Business | 1 | 1 | Ching Kuo |
| AS151350 | Other Business | 1 | 1 | NIPPON COMMUNICATIONS INC. |
| AS151371 | Other Business | 1 | 1 | PAINA Information Development |
| AS152865 | Education | 1 | 1 | Tokyo University of Technology Linux Club |
| AS152867 | Other Business | 1 | 1 | Takaoka cable network |
| AS152870 | Education | 1 | 1 | Incorporated Educational Institution Kaichigakuen |
| AS152876 | Other Business | 1 | 1 | Comota Co., Ltd. |
| AS154486 | Other Business | 1 | 1 | REI MIMURA |
| AS18074 | Hosting Provider | 1 | 1 | FIRST RIDING TECHNOLOGY INC. |
| AS18131 | Other Business | 1 | 1 | NTT DOCOMO BUSINESS, Inc. |
| AS23634 | Education | 1 | 1 | WIDE Project |
| AS23642 | Other Business | 1 | 1 | OBIS |
| AS23774 | Other Business | 1 | 1 | Japan Registry Service Co., Ltd. |
| AS24252 | Other Business | 1 | 1 | Japan Registry Service Co., Ltd. |
| AS24262 | ISP & Mobile | 1 | 1 | HAMANASU INFORMATION Co., Ltd. |
| AS24287 | Education | 1 | 1 | Research Organization of Information and Systems, National Institute of Informatics |
| AS37906 | ISP & Mobile | 1 | 1 | NetIRD Inc. |
| AS37912 | Hosting Provider | 1 | 1 | IPRIO Corporation. |
| AS38629 | ISP & Mobile | 1 | 1 | NTT DOCOMO BUSINESS, Inc |
| AS38644 | ISP & Mobile | 1 | 1 | INTERNET MULTIFEED CO. |
| AS38648 | Other Business | 1 | 1 | F-REGI Co.,Ltd. |
| AS38652 | ISP & Mobile | 1 | 1 | Ginzado Co.,Ltd. |
| AS4690 | Education | 1 | 1 | WIDE Project |
| AS4718 | Other Business | 1 | 1 | Cyber Kansai Project |
| AS55384 | Education | 1 | 1 | Japan Advanced Institute of Science and Technology |
| AS55895 | Other Business | 1 | 1 | N.S.Computer Service Co.,Ltd. |
| AS55901 | Other Business | 1 | 1 | Sony Computer Entertainment Inc |
| AS55910 | Education | 1 | 1 | Shibaura Institute of Technology |
| AS58645 | Other Business | 1 | 1 | Miyagi Cable TV Co.,Ltd |
| AS58649 | Other Business | 1 | 1 | GMO Internet, Inc. |
| AS58651 | Other Business | 1 | 1 | GMO Internet, Inc. |
| AS58785 | Education | 1 | 1 | Tohoku Gakuin University |
| AS59106 | Other Business | 1 | 1 | Cyber and Internet Association |
| AS59110 | Other Business | 1 | 1 | BPS Inc. |
| AS59111 | Education | 1 | 1 | Akita International University |
| AS59115 | Other Business | 1 | 1 | CYBERDYNE Inc. |
| AS59128 | Education | 1 | 1 | Kyoto University Microcomputer Club |
| AS62184 | Other Business | 1 | 1 | Michal Nowak |
| AS63780 | Other Business | 1 | 1 | dual&Co. Inc. |
| AS63790 | Other Business | 1 | 1 | CyberAgent, Inc. |
| AS63791 | Other Business | 1 | 1 | doornoc |
| AS63794 | Other Business | 1 | 1 | ILKS Inc. |