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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.
1,300 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. | 4M | 236 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 113.2K |
| — |
| 9 |
| AS17514JP | AICS - Otsuka Corp. | 115.2K | 65.5K | 68 |
| AS3488JP | JAXAnet - Japan Aerospace Exploration Agency | 117K | — | 13 |
| AS17707JP | DATAHOTEL-JP - AS for DATAHOTEL, which is one of iDC in Japan, | 118.5K | 65.5K | 27 |
| AS24572JP | YAHOO-JP-AS-AP - Yahoo Japan | 118.8K | 65.5K | 5 |
| AS7516JP | TOHKNET - TOHKnet Co.,Inc. | 119K | 8.2K | 10 |
| AS7502JP | IP-KYOTO - Advanced Software Technology & Management Research Institute of KYOTO | 123.4K | — | 7 |
| AS131159JP | AS-YAMAGATAU - Yamagata University | 123.4K | 1 | 7 |
| AS58791JP | GMO-I-R2 - GMO Internet, Inc. | 128.5K | 8.2K | 183 |
| AS58647JP | KAGAWAU-AS - Kagawa University | 129.5K | — | 185 |
| AS55390JP | TUSNET - Tokyo University of Science | 131.1K | 1 | 4 |
| AS38635JP | KEIO-NET - Keio University | 131.1K | 2 | 4 |
| AS131981JP | TAKUSHOKUNET - Takushoku University | 131.1K | — | 6 |
| AS55904JP | KOGAKUIN-AS - KOGAKUIN University | 131.1K | 1 | 4 |
| AS9355JP | NICT - National Institute of Information and Communications Technology | 131.1K | 1 | 3 |
| AS55379JP | hosei-net - Hosei University | 131.1K | 1 | 4 |
| AS38641JP | LEONET-AS - Osaka Sangyo University | 131.1K | — | 3 |
| AS17512JP | JAL - Japan Airlines Co.,Ltd. | 131.1K | — | 3 |
| AS131919JP | MEIJI-NET - Meiji University | 131.1K | — | 3 |
| AS58652JP | Kochi-U-NET - Kochi University | 131.1K | — | 5 |
| AS59104JP | SOKAU-AS - Soka University | 131.1K | — | 3 |
| AS4729JP | JAEA - Japan Atomic Energy Agency | 131.1K | — | 2 |
| AS17701JP | SEINAN - Seinan Gakuin University | 131.1K | 1 | 4 |
| AS17687JP | NICE - National University Corporation Nagoya University | 131.3K | — | 3 |
| AS7509JP | HINES - Hokkaido University | 131.3K | — | 3 |
| AS17944JP | JWA - Japan Weather Association | 131.8K | 1 | 6 |
| AS2504JP | NCA5 - Kyoto University | 132.1K | — | 4 |
| AS37917JP | UTINS - University of Tsukuba | 132.1K | — | 3 |
| AS7670JP | CTNET - Enecom,Inc. | 134.7K | 65.5K | 20 |
| AS63802JP | MIKAKA-EAST - Nippon Telegraph and Telephone East Corporation | 134.9K | — | 17 |
| AS18087JP | TOYO - Toyo University | 135.2K | 1 | 5 |
| AS17529JP | MediaCat - STARCAT Co .,LTD. | 135.4K | 65.5K | 14 |
| AS37918JP | ECL-INET - NTT, Inc. | 136.5K | 1 | 23 |
| AS18271JP | EVOnet - Sojitz Tech Innovation Co., Ltd. | 139.3K | — | 6 |
| AS38631JP | LINE - LY Corporation | 143.1K | 65.7K | 265 |
| AS23820JP | RAKUTEN - Rakuten Group, Inc. | 143.6K | 70.7K | 17 |
| AS10006JP | SECOMTRUST - SECOM Trust Systems Co.,Ltd. | 146.2K | 2 | 57 |
| AS9622JP | KCT - Kurashiki Cable TV | 157.7K | 65.5K | 51 |
| AS9997JP | MECHA - Suzuka Cable Co.,Ltd | 157.7K | 65.5K | 11 |
| AS9614JP | OCT - JCOM Marketing Co.,Ltd. | 165.9K | — | 25 |
| AS9374JP | EDION - EDION Corporation | 165.9K | 65.5K | 23 |
| AS17698JP | CCNET-NET - COMMUNITY NETWORK CENTER INCORPORATED. | 174.1K | — | 37 |
| AS131921JP | GMOCL - GMO GlobalSign Holdings K.K. | 180.2K | 2K | 68 |
| AS59108JP | KATCH-NET - KATCH NETWORK INC. | 192.5K | 256 | 46 |
| AS7514JP | MEX - Computer Engineering & Consulting, Ltd. | 196.1K | 65.5K | 23 |
| AS18268JP | JANIS - Naganoken Kyodou Densan Co.Ltd. | 198.1K | 65.5K | 10 |
| AS23793JP | AIST - National Institute of Advanced Industrial Science and Technology | 199.9K | — | 18 |