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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 |
| 65.5K |
| — |
| 1 |
| AS131930JP | TBS-NET - Tokyo Broadcasting System Television, Inc. | 65.5K | — | 1 |
| AS24275JP | TOTO - TOTO LTD. | 65.5K | — | 1 |
| AS17956JP | WASEDA - WASEDA University | 65.5K | — | 1 |
| AS24248JP | ASN-WADAI-U - Wakayama University | 65.5K | — | 1 |
| AS131938JP | NISSAN-NET - NISSAN MOTOR CO.,LTD. | 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 |
| AS2513JP | JST - Japan Science and Technology Agency | 65.5K | — | 1 |
| AS10014JP | NIHON-U - Nihon University | 65.5K | 1 | 2 |
| AS58785JP | TGU-NET - Tohoku Gakuin University | 65.5K | 1 | 2 |
| AS24268JP | SAINS - National University Corporation Shizuoka University | 65.5K | — | 1 |
| AS17523JP | AOYAMA - Aoyama Gakuin University | 65.5K | — | 2 |
| AS23615JP | KUSANAGI - University of Shizuoka | 65.5K | — | 1 |
| AS2508JP | kyushu-u - Kyushu University | 65.5K | — | 1 |
| AS2500JP | WIDE-BB - WIDE Project | 65.5K | 65.5K | 4 |
| AS17946JP | GUCC - Gifu University | 65.5K | — | 1 |
| AS63777JP | STARCLUSTER - National Institutes of Natural Sciences National Astronomical Observatory of JAPAN | 65.5K | — | 1 |
| AS18128JP | RIKEN - RIKEN | 65.5K | — | 1 |
| AS9593JP | NIKKEI - Nikkei Inc. | 65.5K | — | 1 |
| AS18148JP | FUKUOKA-U - Fukuoka University | 65K | 65.5K | 9 |
| AS131918JP | SCN-NET - SHONAN CABLE NETWORK | 61.4K | 65.5K | 13 |
| AS18134JP | KITANET - JCOM Co., Ltd. | 59.4K | — | 24 |
| AS59125JP | CYBERHOME1 - FAMILY NET JAPAN INCORPORATED | 58.9K | 393.2K | 19 |
| AS23783JP | CNA - Cable Networks Akita Co.,ltd. | 55K | 65.5K | 21 |
| AS18068JP | ACROSS - Dream Wave Shizuoka Co. Ltd. | 54K | 65.8K | 53 |
| AS37892JP | WAI-NET - Cable Media WAIWAI Co.,Ltd. | 52.2K | 65.5K | 7 |
| AS17675JP | AS-PNAPTOK - PacketFabric (Japan) Co., Ltd. | 52.2K | 65.5K | 17 |
| AS24271JP | iCTV - Iruma CATV co. | 51.2K | 65.5K | 9 |
| AS4680JP | MIND - Mitsubishi Electric Information Network Corporation | 51.2K | 65.5K | 27 |
| AS23791JP | LCV - LCV Corporation | 51.2K | 65.5K | 7 |
| AS55387JP | RMGR-MIX - Japan Communication Inc. | 49.2K | — | 2 |
| AS23788JP | HICT - JCOM Co., Ltd. | 49.2K | — | 21 |
| AS4677JP | PTOP - Marubeni OKI Network Solutions Inc. | 48.9K | — | 9 |
| AS10019JP | MCTV - Matsusaka Cable-TV Station Inc. | 47.1K | 65.5K | 12 |
| AS18278JP | CC9N - Cable TV Corporation | 47.1K | 65.5K | 10 |
| AS18282JP | CORALNET - Tonami System Solutions Co., Ltd. | 47.1K | 65.5K | 12 |
| AS55900JP | GLBB-JP - GLBB Japan KK | 46.1K | 65.5K | 28 |
| AS4693JP | CSK - CSK-IT MANAGEMENT CORPORATION | 45.1K | 65.5K | 8 |
| AS10003JP | OCT-NET - Ogaki Cable Television Co.,Inc. | 45.1K | 65.5K | 14 |
| AS23785JP | SUNFIELD - SUN FIELD INTERNET LIMITED | 45.1K | — | 3 |
| AS17955JP | AVISNET - Densan Co., Ltd. | 43.5K | 65.5K | 12 |
| AS2511JP | CORE - Nippon Telegraph and Telephone Corporation | 41.7K | — | 5 |
| AS131934JP | ICC-NET - ICC Corporation | 41K | 65.5K | 13 |
| AS24276JP | ICNET - JCOM Co., Ltd. | 41K | — | 6 |
| AS7676JP | TAM - TAM Co., Ltd. | 39.7K | 196.6K | 26 |
| AS18135JP | BTV - BTV CO.,LTD. | 38.9K | 65.5K | 11 |
| AS59109JP | HITCLOUD - Hitachi,Ltd., Managed & Platform Services Business Division | 38.9K | — | 111 |