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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 |
| 65.5K |
| 19 |
| AS4711JP | INTEC - INTEC Inc. | 108.5K | 65.5K | 21 |
| AS10021JP | KVH - KVH Co.,Ltd | 110.8K | 65.5K | 49 |
| AS2526JP | HITNET - Hitachi, Ltd. IT strategy & Digital Integration Division, Employee Experience Office | 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 |
| AS55904JP | KOGAKUIN-AS - KOGAKUIN University | 131.1K | 1 | 4 |
| AS131919JP | MEIJI-NET - Meiji University | 131.1K | — | 3 |
| AS9355JP | NICT - National Institute of Information and Communications Technology | 131.1K | 1 | 3 |
| AS4729JP | JAEA - Japan Atomic Energy Agency | 131.1K | — | 2 |
| AS131981JP | TAKUSHOKUNET - Takushoku University | 131.1K | — | 6 |
| AS17701JP | SEINAN - Seinan Gakuin University | 131.1K | 1 | 4 |
| AS38641JP | LEONET-AS - Osaka Sangyo University | 131.1K | — | 3 |
| AS38635JP | KEIO-NET - Keio University | 131.1K | 2 | 4 |
| AS55390JP | TUSNET - Tokyo University of Science | 131.1K | 1 | 4 |
| AS59104JP | SOKAU-AS - Soka University | 131.1K | — | 3 |
| AS17512JP | JAL - Japan Airlines Co.,Ltd. | 131.1K | — | 3 |
| AS55379JP | hosei-net - Hosei University | 131.1K | 1 | 4 |
| AS58652JP | Kochi-U-NET - Kochi University | 131.1K | — | 5 |
| 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 |
| AS9997JP | MECHA - Suzuka Cable Co.,Ltd | 157.7K | 65.5K | 11 |
| AS9622JP | KCT - Kurashiki Cable TV | 157.7K | 65.5K | 51 |
| AS9374JP | EDION - EDION Corporation | 165.9K | 65.5K | 23 |
| AS9614JP | OCT - JCOM Marketing Co.,Ltd. | 165.9K | — | 25 |
| 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 | 4.4K | 47 |