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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 |
| KATCH-NET - KATCH NETWORK INC. |
| 192.5K |
| 256 |
| 46 |
| AS131921JP | GMOCL - GMO GlobalSign Holdings K.K. | 178.7K | 2K | 66 |
| AS17698JP | CCNET-NET - COMMUNITY NETWORK CENTER INCORPORATED. | 174.1K | — | 37 |
| 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 | 157.7K | 65.5K | 51 |
| AS10006JP | SECOMTRUST - SECOM Trust Systems Co.,Ltd. | 146.2K | 2 | 57 |
| 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 |
| AS55379JP | hosei-net - Hosei University | 131.1K | 1 | 4 |
| AS17512JP | JAL - Japan Airlines Co.,Ltd. | 131.1K | — | 3 |
| AS131981JP | TAKUSHOKUNET - Takushoku University | 131.1K | — | 6 |
| AS4729JP | JAEA - Japan Atomic Energy Agency | 131.1K | — | 2 |
| AS38635JP | KEIO-NET - Keio University | 131.1K | 2 | 4 |
| AS9355JP | NICT - National Institute of Information and Communications Technology | 131.1K | 1 | 3 |
| AS131919JP | MEIJI-NET - Meiji University | 131.1K | — | 3 |
| AS59104JP | SOKAU-AS - Soka University | 131.1K | — | 3 |
| AS55904JP | KOGAKUIN-AS - KOGAKUIN University | 131.1K | 1 | 4 |
| AS58652JP | Kochi-U-NET - Kochi University | 131.1K | — | 5 |
| AS17701JP | SEINAN - Seinan Gakuin University | 131.1K | 1 | 4 |
| AS38641JP | LEONET-AS - Osaka Sangyo University | 131.1K | — | 3 |
| AS58647JP | KAGAWAU-AS - Kagawa University | 128.9K | — | 183 |
| AS131159JP | AS-YAMAGATAU - Yamagata University | 123.4K | 1 | 7 |
| AS7502JP | IP-KYOTO - Advanced Software Technology & Management Research Institute of KYOTO | 123.4K | — | 7 |
| AS58791JP | GMO-I-R2 - GMO Internet, Inc. | 120.1K | 8.2K | 180 |
| 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 |
| 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 | 49 |
| AS4711JP | INTEC - INTEC Inc. | 108.5K | 65.5K | 21 |
| AS17686JP | ACCELIA - ACCELIA | 107K | 65.5K | 19 |