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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
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 | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
| KATCH-NET - KATCH NETWORK INC. |
| 192.5K |
| 256 |
| 46 |
| AS17698JP | CCNET-NET - COMMUNITY NETWORK CENTER INCORPORATED. | 174.1K | — | 37 |
| AS131921JP | GMOCL - GMO GlobalSign Holdings K.K. | 170.2K | 2K | 59 |
| AS9614JP | OCT - JCOM Marketing Co.,Ltd. | 165.9K | — | 25 |
| AS9374JP | EDION - EDION Corporation | 165.9K | 65.5K | 23 |
| AS9997JP | MECHA - Suzuka Cable Co.,Ltd | 157.7K | 65.5K | 11 |
| AS9622JP | KCT - Kurashiki Cable TV | 149.5K | 65.5K | 48 |
| AS10006JP | SECOMTRUST - SECOM Trust Systems Co.,Ltd. | 148.2K | 2 | 58 |
| AS23820JP | RAKUTEN - Rakuten Group, Inc. | 143.6K | 70.7K | 17 |
| AS38631JP | LINE - LY Corporation | 142.6K | 65.7K | 263 |
| AS18271JP | EVOnet - Sojitz Tech Innovation Co., Ltd. | 139.3K | — | 6 |
| AS37918JP | ECL-INET - NTT, Inc. | 136.5K | 1 | 23 |
| AS17529JP | MediaCat - STARCAT Co .,LTD. | 135.4K | 65.5K | 14 |
| AS18087JP | TOYO - Toyo University | 135.2K | 1 | 5 |
| AS63802JP | MIKAKA-EAST - Nippon Telegraph and Telephone East Corporation | 134.9K | — | 17 |
| AS7670JP | CTNET - Enecom,Inc. | 134.7K | 65.5K | 20 |
| AS2504JP | NCA5 - Kyoto University | 132.1K | — | 4 |
| AS37917JP | UTINS - University of Tsukuba | 132.1K | — | 3 |
| AS17944JP | JWA - Japan Weather Association | 131.8K | 1 | 6 |
| AS7509JP | HINES - Hokkaido University | 131.3K | — | 3 |
| AS17687JP | NICE - National University Corporation Nagoya University | 131.3K | — | 3 |
| AS55390JP | TUSNET - Tokyo University of Science | 131.1K | 1 | 4 |
| AS4729JP | JAEA - Japan Atomic Energy Agency | 131.1K | — | 2 |
| AS58652JP | Kochi-U-NET - Kochi University | 131.1K | — | 5 |
| AS131919JP | MEIJI-NET - Meiji University | 131.1K | — | 3 |
| AS131981JP | TAKUSHOKUNET - Takushoku University | 131.1K | — | 6 |
| AS38635JP | KEIO-NET - Keio University | 131.1K | 2 | 4 |
| AS9355JP | NICT - National Institute of Information and Communications Technology | 131.1K | 1 | 3 |
| AS17701JP | SEINAN - Seinan Gakuin University | 131.1K | 1 | 4 |
| AS59104JP | SOKAU-AS - Soka University | 131.1K | — | 3 |
| AS55904JP | KOGAKUIN-AS - KOGAKUIN University | 131.1K | 1 | 4 |
| AS17512JP | JAL - Japan Airlines Co.,Ltd. | 131.1K | — | 3 |
| AS55379JP | hosei-net - Hosei University | 131.1K | 1 | 4 |
| AS38641JP | LEONET-AS - Osaka Sangyo University | 131.1K | — | 3 |
| AS58647JP | KAGAWAU-AS - Kagawa University | 128.8K | — | 182 |
| AS131159JP | AS-YAMAGATAU - Yamagata University | 123.4K | 1 | 7 |
| AS7502JP | IP-KYOTO - Advanced Software Technology & Management Research Institute of KYOTO | 123.4K | — | 7 |
| AS7516JP | TOHKNET - TOHKnet Co.,Inc. | 119K | 8.2K | 10 |
| AS24572JP | YAHOO-JP-AS-AP - Yahoo Japan | 118.8K | 65.5K | 5 |
| AS17707JP | DATAHOTEL-JP - AS for DATAHOTEL, which is one of iDC in Japan, | 118.5K | 65.5K | 27 |
| AS58791JP | GMO-I-R2 - GMO Internet, Inc. | 117.5K | 8.2K | 176 |
| AS3488JP | JAXAnet - Japan Aerospace Exploration Agency | 117K | — | 13 |
| AS17514JP | AICS - Otsuka Corp. | 115.2K | 65.5K | 68 |
| AS2526JP | HITNET - Hitachi, Ltd. IT strategy & Digital Integration Division, Employee Experience Office | 113.2K | — | 9 |
| AS10021JP | KVH - KVH Co.,Ltd | 110.8K | 65.5K | 50 |
| AS4711JP | INTEC - INTEC Inc. | 108.5K | 65.5K | 21 |
| AS17686JP | ACCELIA - ACCELIA | 107K | 65.5K | 19 |