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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.
| AS | Holder | IPv4 | Prefixes |
|---|---|---|---|
| AS17676JP | GIGAINFRA - SoftBank Corp. | 49.1M | 476 |
| AS4713JP | OCN - NTT DOCOMO BUSINESS,Inc. | 28.6M | 186 |
| AS2516JP | KDDI - KDDI CORPORATION | 18.2M | 572 |
| AS9824JP | JTCL-JP-AS - JCOM Co., Ltd. | 10.3M | 293 |
| AS2907JP | SINET-AS - Research Organization of Information and Systems, National Institute of Informatics | 9M | 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 |
Share of announced address space covered by valid Route Origin Authorizations.
1,297 autonomous systems registered to Japan. Click an AS for detail.
| AS | Holder | IPv4 ↓ | IPv6 /48 | Prefixes |
|---|---|---|---|---|
| AS18276JP | KAISER - Kansai University | 65.5K | — | 1 |
| AS23807JP | RITSUMEI - Ritsumeikan University | 65.5K | — | 1 |
| AS45685JP | RIKKYO-U - Rikkyo Gakuin Rikkyo University | 65.5K | — | 1 |
| AS17960JP | RAINS-AS - University of the Ryukyus | 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 |