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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 | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
| GMO-I-R2 - GMO Internet, Inc. |
| 117.5K |
| 8.2K |
| 176 |
| 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 |
| AS131159JP | AS-YAMAGATAU - Yamagata University | 123.4K | 1 | 7 |
| AS7502JP | IP-KYOTO - Advanced Software Technology & Management Research Institute of KYOTO | 123.4K | — | 7 |
| AS58647JP | KAGAWAU-AS - Kagawa University | 128.8K | — | 182 |
| AS55390JP | TUSNET - Tokyo University of Science | 131.1K | 1 | 4 |
| AS55904JP | KOGAKUIN-AS - KOGAKUIN University | 131.1K | 1 | 4 |
| AS131919JP | MEIJI-NET - Meiji University | 131.1K | — | 3 |
| AS55379JP | hosei-net - Hosei University | 131.1K | 1 | 4 |
| AS4729JP | JAEA - Japan Atomic Energy Agency | 131.1K | — | 2 |
| AS9355JP | NICT - National Institute of Information and Communications Technology | 131.1K | 1 | 3 |
| AS131981JP | TAKUSHOKUNET - Takushoku University | 131.1K | — | 6 |
| AS58652JP | Kochi-U-NET - Kochi University | 131.1K | — | 5 |
| AS59104JP | SOKAU-AS - Soka University | 131.1K | — | 3 |
| AS38635JP | KEIO-NET - Keio University | 131.1K | 2 | 4 |
| AS17512JP | JAL - Japan Airlines Co.,Ltd. | 131.1K | — | 3 |
| AS17701JP | SEINAN - Seinan Gakuin University | 131.1K | 1 | 4 |
| AS38641JP | LEONET-AS - Osaka Sangyo University | 131.1K | — | 3 |
| 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 |
| AS37917JP | UTINS - University of Tsukuba | 132.1K | — | 3 |
| AS2504JP | NCA5 - Kyoto University | 132.1K | — | 4 |
| 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 | 142.6K | 65.7K | 263 |
| AS23820JP | RAKUTEN - Rakuten Group, Inc. | 143.6K | 70.7K | 17 |
| AS10006JP | SECOMTRUST - SECOM Trust Systems Co.,Ltd. | 148.2K | 2 | 58 |
| AS9622JP | KCT - Kurashiki Cable TV | 149.5K | 65.5K | 48 |
| AS9997JP | MECHA - Suzuka Cable Co.,Ltd | 157.7K | 65.5K | 11 |
| AS9374JP | EDION - EDION Corporation | 165.9K | 65.5K | 23 |
| AS9614JP | OCT - JCOM Marketing Co.,Ltd. | 165.9K | — | 25 |
| AS131921JP | GMOCL - GMO GlobalSign Holdings K.K. | 170.2K | 2K | 59 |
| AS17698JP | CCNET-NET - COMMUNITY NETWORK CENTER INCORPORATED. | 174.1K | — | 37 |
| 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 |
| AS9354JP | TDNC - Community Network Center Inc. | 200.4K | 65.5K | 38 |
| AS4686JP | BEKKOAME - BEKKOAME INTERNET INC. | 200.4K | 65.5K | 66 |
| AS2501JP | UTnet - The University of Tokyo | 200.7K | 65.5K | 6 |