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 |
|---|---|---|---|---|
| AS17686 | Other Business | 18 | 1 | Accelia, Inc. |
| AS18136 | ISP & Mobile | 18 | 0 | JCOM Co., Ltd. |
| AS23793 | Government | 18 | 0 | National Institute of Advanced Industrial Science and Technology |
| AS55381 | ISP & Mobile | 18 | 0 | CITY-CABLE SHUNAN Corporation |
| AS139076 | Hosting Provider | 17 | 1 | EnjoyVC Japan Corporation |
| AS63802 | ISP & Mobile | 17 | 0 | Nippon Telegraph and Telephone East Corporation |
| AS7677 | Other Business | 17 | 0 | Dai Nippon Printing Co., Ltd |
| AS59127 | ISP & Mobile | 16 | 5 | Newmedia Corporation |
| AS38628 | ISP & Mobile | 16 | 1 | HIMEJI CABLE TELEVISION CORPORATION |
| AS151389 | Other Business | 16 | 0 | Synergy Cross Corporation |
| AS18071 | Other Business | 16 | 0 | Panasonic Information Systems Co., Ltd |
| AS59125 | ISP & Mobile | 15 | 4 | FAMILY NET JAPAN INCORPORATED |
| AS2506 | Other Business | 15 | 1 | NTT BUSINESS SOLUTIONS CORPORATION |
| AS9600 | ISP & Mobile | 15 | 1 | So-net Corporation |
| AS2512 | ISP & Mobile | 15 | 0 | TCP Inc. |
| AS2522 | Other Business | 15 | 0 | Japan Network Information Center |
| AS55902 | Other Business | 15 | 0 | TS-NET of TOSET, Inc. in Japan |
| AS63771 | Other Business | 14 | 8 | Border Gateway Protocol Network Analysis Project |
| AS18127 | Government | 14 | 2 | Ibaraki Prefectural Government |
| AS17675 | ISP & Mobile | 14 | 1 | PacketFabric (Japan) Co., Ltd. |
| AS17961 | Hosting Provider | 14 | 1 | mitene internet co., ltd. |
| AS24259 | ISP & Mobile | 14 | 1 | kanuma cable television Corporation |
| AS9365 | ISP & Mobile | 14 | 1 | its communications Inc. |
| AS131899 | Other Business | 14 | 0 | DIG Inc. |
| AS59092 | Hosting Provider | 14 | 0 | kronos.Co.,Ltd. |
| AS151373 | Other Business | 13 | 2 | JAPAN 3D PRINTER |
| AS10003 | ISP & Mobile | 13 | 1 | Ogaki Cable Television Co.,Inc. |
| AS17529 | ISP & Mobile | 13 | 1 | STARCAT CABLE NETWORK Co .,LTD. |
| AS23629 | ISP & Mobile | 13 | 1 | Obihiro City Cable Co.,Ltd. |
| AS23639 | Other Business | 13 | 1 | NTT Bizlink, Inc. |
| AS24336 | Other Business | 13 | 0 | Digitalbank Corporation |
| AS3488 | Government | 13 | 0 | Information Systems Department, Japan Aerospace Exploration Agency |
| AS59116 | Other Business | 12 | 5 | AIG Technologies KK |
| AS58793 | Other Business | 12 | 3 | FUJITSU LIMITED |
| AS131916 | ISP & Mobile | 12 | 1 | Tokyo Bay Network Co.,Ltd. |
| AS131918 | ISP & Mobile | 12 | 1 | SHONAN CABLE NETWORK |
| AS131934 | ISP & Mobile | 12 | 1 | ICC Corporation |
| AS23624 | ISP & Mobile | 12 | 1 | Chukai Television Co,.Ltd. |
| AS23661 | Other Business | 12 | 1 | CLARA, Inc. |
| AS9621 | ISP & Mobile | 12 | 1 | Okinawa Telecommunication Network Co.,Inc |
| AS58650 | ISP & Mobile | 12 | 0 | Warabi Cable Vision Co., Ltd. |
| AS7513 | Other Business | 12 | 0 | Hitachi Systems, Ltd. |
| AS23820 | Other Business | 11 | 6 | Rakuten Group, Inc. |
| AS10004 | ISP & Mobile | 11 | 1 | Phoenix Communications Inc. |
| AS10019 | ISP & Mobile | 11 | 1 | Matsusaka Cable-TV Station Inc. |
| AS139468 | Other Business | 11 | 1 | DC Communications Inc. |
| AS17955 | Other Business | 11 | 1 | Densan Co., Ltd. |
| AS18282 | Other Business | 11 | 1 | Tonami System Solutions Co., Ltd. |
| AS131950 | Other Business | 11 | 0 | EnjoyVC Japan Corporation |
| AS137445 | Other Business | 11 | 0 | PF LINK SYSTEMS |
| AS18272 | Education | 11 | 0 | Benesse Corporation |
| AS7663 | Other Business | 11 | 0 | FUJIMIC INC. |
| AS10001 | ISP & Mobile | 10 | 1 | Mics Network Corporation |
| AS131923 | ISP & Mobile | 10 | 1 | MCAT Ltd. |
| AS17939 | Other Business | 10 | 1 | miyazaki cabletelevision network Co.,LTD |
| AS18124 | Education | 10 | 1 | Okayama University of Science |
| AS23778 | ISP & Mobile | 10 | 1 | IMIZU CABLE NETWORK CO.,LTD. |
| AS24295 | ISP & Mobile | 10 | 1 | PacketFabric (Japan) Co., Ltd. |
| AS63784 | Government | 10 | 1 | Digital Agency |
| AS9997 | ISP & Mobile | 10 | 1 | Suzuka Cable Co.,Ltd |
| AS9999 | Hosting Provider | 10 | 1 | AT TOKYO Corporation |
| AS58789 | Other Business | 10 | 0 | DUNAMIS Co.,Ltd |
| AS9615 | ISP & Mobile | 10 | 0 | TOYOHASHI CABLE NETWORK INC. |
| AS131925 | ISP & Mobile | 9 | 4 | FAMILY NET JAPAN INCORPORATED |
| AS17682 | Other Business | 9 | 4 | 296 BROAD NET Com Inc |
| AS63770 | Other Business | 9 | 4 | Industrial Cyber Security Center of Excellence |
| AS131911 | ISP & Mobile | 9 | 3 | HONJYO CABLE VISION CO., LTD. |
| AS131937 | ISP & Mobile | 9 | 2 | Joetsu Cable Vision |
| AS17931 | ISP & Mobile | 9 | 1 | Netforest,Inc |
| AS18268 | ISP & Mobile | 9 | 1 | Naganoken Kyodou Densan Co.Ltd. |
| AS18278 | Other Business | 9 | 1 | Cable TV Corporation |
| AS59123 | Other Business | 9 | 1 | Kakaku.com, Inc. |
| AS7516 | ISP & Mobile | 9 | 1 | TOHKnet Co.,Inc. |
| AS7529 | ISP & Mobile | 9 | 1 | NetIRD Inc. |
| AS7668 | ISP & Mobile | 9 | 1 | Hokuriku Telecommunication Network Co. |
| AS7690 | ISP & Mobile | 9 | 1 | Mirai Communication Network Inc. |
| AS9993 | Other Business | 9 | 1 | ITOCHU Techno-Solutions Corporation |
| AS131896 | Hosting Provider | 9 | 0 | SSI Lab Inc. |
| AS23784 | Other Business | 9 | 0 | SQUARE ENIX CO., LTD. |
| AS2526 | Other Business | 9 | 0 | Hitachi, Ltd. |
| AS38627 | Other Business | 9 | 0 | Baidu, Inc. |
| AS4677 | Other Business | 9 | 0 | Marubeni OKI Network Solutions Inc. |
| AS59103 | Other Business | 8 | 7 | SoftEther Corporation |
| AS136796 | Other Business | 8 | 4 | CORELINK JAPAN |
| AS63774 | Other Business | 8 | 4 | Kamoike.net LLP |
| AS9619 | Other Business | 8 | 3 | Sony Global Solutions Inc. |
| AS18148 | Education | 8 | 1 | Fukuoka University |
| AS18274 | ISP & Mobile | 8 | 1 | Utsunomiya Cable TV Corporation |
| AS24249 | ISP & Mobile | 8 | 1 | jway co., Ltd |
| AS24271 | ISP & Mobile | 8 | 1 | iruma cable TV |
| AS24279 | ISP & Mobile | 8 | 1 | SENDAI CATV CO.,LTD. |
| AS24284 | Other Business | 8 | 1 | CYBER AGENT, LTD. |
| AS55385 | ISP & Mobile | 8 | 1 | Digital Alliance Co.,Ltd. |
| AS63997 | Other Business | 8 | 1 | JMF Investment & Technology PTY LTD |
| AS7521 | ISP & Mobile | 8 | 1 | INTERNET MULTIFEED CO. |
| AS131944 | Other Business | 8 | 0 | KADOKAWA DWANGO CORPORATION |
| AS136506 | Hosting Provider | 8 | 0 | LEON CO.LTD |
| AS152324 | ISP & Mobile | 8 | 0 | 3XNET Co., Ltd. |
| AS18129 | ISP & Mobile | 8 | 0 | OKAYAMA NETWORK INC. |
| AS37891 | Other Business | 8 | 0 | JR TOKAI Information Systems Company |