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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.
1,303 autonomous systems registered to Japan. Click an AS for detail.
| 668 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4.2M | 269 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 38.9K |
| — |
| 111 |
| AS17530JP | NNS - Nihon Network Service Co, .Ltd. | 38.9K | 65.5K | 5 |
| AS7676JP | TAM - TAM Co., Ltd. | 39.7K | 196.6K | 26 |
| AS24276JP | ICNET - JCOM Co., Ltd. | 41K | — | 6 |
| AS2511JP | CORE - Nippon Telegraph and Telephone Corporation | 41.7K | — | 5 |
| AS17955JP | AVISNET - Densan Co., Ltd. | 43.5K | 65.5K | 12 |
| AS23785JP | SUNFIELD - SUN FIELD INTERNET LIMITED | 45.1K | — | 3 |
| AS10003JP | OCT-NET - Ogaki Cable Television Co.,Inc. | 45.1K | 65.5K | 14 |
| AS4693JP | CSK - CSK-IT MANAGEMENT CORPORATION | 45.1K | 65.5K | 8 |
| AS18278JP | CC9N - Cable TV Corporation | 47.1K | 65.5K | 10 |
| AS18282JP | CORALNET - Tonami System Solutions Co., Ltd. | 47.1K | 65.5K | 12 |
| AS10019JP | MCTV - Matsusaka Cable-TV Station Inc. | 47.1K | 65.5K | 12 |
| AS4677JP | PTOP - Marubeni OKI Network Solutions Inc. | 48.9K | — | 9 |
| AS23788JP | HICT - JCOM Co., Ltd. | 49.2K | — | 21 |
| AS131934JP | ICC-NET - ICC Corporation | 49.2K | 65.5K | 14 |
| AS55387JP | RMGR-MIX - Japan Communication Inc. | 49.2K | — | 2 |
| AS24271JP | iCTV - Iruma CATV co. | 51.2K | 65.5K | 9 |
| AS23791JP | LCV - LCV Corporation | 51.2K | 65.5K | 7 |
| AS4680JP | MIND - Mitsubishi Electric Information Network Corporation | 51.2K | 65.5K | 27 |
| AS37892JP | WAI-NET - Cable Media WAIWAI Co.,Ltd. | 52.2K | 65.5K | 7 |
| AS17675JP | AS-PNAPTOK - PacketFabric (Japan) Co., Ltd. | 52.5K | 65.5K | 18 |
| AS18068JP | ACROSS - Dream Wave Shizuoka Co. Ltd. | 54K | 65.8K | 53 |
| AS23783JP | CNA - Cable Networks Akita Co.,ltd. | 55K | 65.5K | 21 |
| AS55900JP | GLBB-JP - GLBB Japan KK | 57.3K | 65.5K | 32 |
| 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 |
| AS17523JP | AOYAMA - Aoyama Gakuin University | 65.5K | — | 2 |
| AS2513JP | JST - Japan Science and Technology Agency | 65.5K | — | 1 |
| AS2500JP | WIDE-BB - WIDE Project | 65.5K | 65.5K | 4 |
| AS23807JP | RITSUMEI - Ritsumeikan University | 65.5K | — | 1 |
| AS17946JP | GUCC - Gifu University | 65.5K | — | 1 |
| AS131938JP | NISSAN-NET - NISSAN MOTOR CO.,LTD. | 65.5K | — | 1 |
| AS17510JP | ISID - INFORMATION SERVICES INTERNATIONAL - DENTSU, LTD. | 65.5K | — | 1 |
| AS63777JP | STARCLUSTER - National Institutes of Natural Sciences National Astronomical Observatory of JAPAN | 65.5K | — | 1 |
| AS2508JP | kyushu-u - Kyushu University | 65.5K | — | 1 |
| AS55380JP | KAINS - Kanazawa University | 65.5K | — | 1 |
| AS9991JP | SHUDO-U - Hiroshima Shudo University | 65.5K | 1 | 2 |
| AS18276JP | KAISER - Kansai University | 65.5K | — | 1 |
| AS23623JP | CHUO-U - Chuo University | 65.5K | — | 1 |
| AS10014JP | NIHON-U - Nihon University | 65.5K | 1 | 2 |
| AS58785JP | TGU-NET - Tohoku Gakuin University | 65.5K | 1 | 2 |
| AS17960JP | RAINS-AS - University of the Ryukyus | 65.5K | — | 1 |
| AS24248JP | ASN-WADAI-U - Wakayama University | 65.5K | — | 1 |
| AS24268JP | SAINS - National University Corporation Shizuoka University | 65.5K | — | 1 |
| AS24254JP | KYOTO-SU - Kyoto Sangyo University | 65.5K | — | 1 |