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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
PeeringDB-registered presence.
APNIC-measured end-user deployment.
Clean prefixes (valid RPKI + IRR, no mismatch).
Cumulative IPv4, IPv6, and ASN allocations to Japan over time.
The largest autonomous systems registered to Japan by IPv4 footprint.
Share of announced address space covered by valid Route Origin Authorizations.
1,297 autonomous systems registered to Japan. Click an AS for detail.
| 669 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 206 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 43.5K |
| 65.5K |
| 12 |
| AS23785JP | SUNFIELD - SUN FIELD INTERNET LIMITED | 45.1K | — | 3 |
| AS4693JP | CSK - CSK-IT MANAGEMENT CORPORATION | 45.1K | 65.5K | 8 |
| AS10003JP | OCT-NET - Ogaki Cable Television Co.,Inc. | 45.1K | 65.5K | 14 |
| AS55900JP | GLBB-JP - GLBB Japan KK | 46.1K | 65.5K | 28 |
| AS18278JP | CC9N - Cable TV Corporation | 47.1K | 65.5K | 10 |
| AS10019JP | MCTV - Matsusaka Cable-TV Station Inc. | 47.1K | 65.5K | 12 |
| AS18282JP | CORALNET - Tonami System Solutions Co., Ltd. | 47.1K | 65.5K | 12 |
| AS4677JP | PTOP - Marubeni OKI Network Solutions Inc. | 48.9K | — | 9 |
| AS55387JP | RMGR-MIX - Japan Communication Inc. | 49.2K | — | 2 |
| AS23788JP | HICT - JCOM Co., Ltd. | 49.2K | — | 21 |
| AS4680JP | MIND - Mitsubishi Electric Information Network Corporation | 51.2K | 65.5K | 27 |
| AS24271JP | iCTV - Iruma CATV co. | 51.2K | 65.5K | 9 |
| AS23791JP | LCV - LCV Corporation | 51.2K | 65.5K | 7 |
| AS17675JP | AS-PNAPTOK - PacketFabric (Japan) Co., Ltd. | 52.2K | 65.5K | 17 |
| AS37892JP | WAI-NET - Cable Media WAIWAI Co.,Ltd. | 52.2K | 65.5K | 7 |
| AS18068JP | ACROSS - Dream Wave Shizuoka Co. Ltd. | 54K | 65.8K | 53 |
| AS23783JP | CNA - Cable Networks Akita Co.,ltd. | 55K | 65.5K | 21 |
| AS59125JP | CYBERHOME1 - FAMILY NET JAPAN INCORPORATED | 58.9K | 393.2K | 19 |
| AS18134JP | KITANET - JCOM Co., Ltd. | 59.4K | — | 24 |
| AS131918JP | SCN-NET - SHONAN CABLE NETWORK | 61.4K | 65.5K | 13 |
| AS18148JP | FUKUOKA-U - Fukuoka University | 65K | 65.5K | 9 |
| AS17956JP | WASEDA - WASEDA University | 65.5K | — | 1 |
| AS55380JP | KAINS - Kanazawa University | 65.5K | — | 1 |
| AS17946JP | GUCC - Gifu University | 65.5K | — | 1 |
| AS45685JP | RIKKYO-U - Rikkyo Gakuin Rikkyo University | 65.5K | — | 1 |
| AS37910JP | CUNET - Chubu University | 65.5K | — | 1 |
| AS23807JP | RITSUMEI - Ritsumeikan University | 65.5K | — | 1 |
| AS2508JP | kyushu-u - Kyushu University | 65.5K | — | 1 |
| AS58785JP | TGU-NET - Tohoku Gakuin University | 65.5K | 1 | 2 |
| AS24254JP | KYOTO-SU - Kyoto Sangyo University | 65.5K | — | 1 |
| AS23623JP | CHUO-U - Chuo University | 65.5K | — | 1 |
| AS17510JP | ISID - INFORMATION SERVICES INTERNATIONAL - DENTSU, LTD. | 65.5K | — | 1 |
| AS24275JP | TOTO - TOTO LTD. | 65.5K | — | 1 |
| AS17960JP | RAINS-AS - University of the Ryukyus | 65.5K | — | 1 |
| AS131930JP | TBS-NET - Tokyo Broadcasting System Television, Inc. | 65.5K | — | 1 |
| AS2500JP | WIDE-BB - WIDE Project | 65.5K | 65.5K | 4 |
| AS18128JP | RIKEN - RIKEN | 65.5K | — | 1 |
| AS24268JP | SAINS - National University Corporation Shizuoka University | 65.5K | — | 1 |
| AS63777JP | STARCLUSTER - National Institutes of Natural Sciences National Astronomical Observatory of JAPAN | 65.5K | — | 1 |
| AS10014JP | NIHON-U - Nihon University | 65.5K | 1 | 2 |
| AS131897JP | EHIME-U - National University Corporation ,Ehime University | 65.5K | — | 1 |
| AS131938JP | NISSAN-NET - NISSAN MOTOR CO.,LTD. | 65.5K | — | 1 |
| AS2513JP | JST - Japan Science and Technology Agency | 65.5K | — | 1 |
| AS17523JP | AOYAMA - Aoyama Gakuin University | 65.5K | — | 2 |
| AS23615JP | KUSANAGI - University of Shizuoka | 65.5K | — | 1 |
| AS18125JP | MAFFIN - Tsukuba Business-Academia Cooperation Support Center, Agriculture, Forestry and Fisheries Research Council Secretariat, Ministry of Agriculture, Forestry and Fisheries | 65.5K | — | 1 |