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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 |
| KATCH-NET - KATCH NETWORK INC. |
| 192.5K |
| 4.4K |
| 47 |
| AS131921JP | GMOCL - GMO GlobalSign Holdings K.K. | 180.2K | 2K | 68 |
| 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 |
| AS9622JP | KCT - Kurashiki Cable TV | 157.7K | 65.5K | 51 |
| AS9997JP | MECHA - Suzuka Cable Co.,Ltd | 157.7K | 65.5K | 11 |
| 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 | 143.1K | 65.7K | 265 |
| 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 |
| AS9355JP | NICT - National Institute of Information and Communications Technology | 131.1K | 1 | 3 |
| AS131981JP | TAKUSHOKUNET - Takushoku University | 131.1K | — | 6 |
| AS17512JP | JAL - Japan Airlines Co.,Ltd. | 131.1K | — | 3 |
| AS131919JP | MEIJI-NET - Meiji University | 131.1K | — | 3 |
| AS55379JP | hosei-net - Hosei University | 131.1K | 1 | 4 |
| AS38641JP | LEONET-AS - Osaka Sangyo University | 131.1K | — | 3 |
| AS55390JP | TUSNET - Tokyo University of Science | 131.1K | 1 | 4 |
| AS17701JP | SEINAN - Seinan Gakuin University | 131.1K | 1 | 4 |
| AS59104JP | SOKAU-AS - Soka University | 131.1K | — | 3 |
| AS58652JP | Kochi-U-NET - Kochi University | 131.1K | — | 5 |
| AS55904JP | KOGAKUIN-AS - KOGAKUIN University | 131.1K | 1 | 4 |
| AS4729JP | JAEA - Japan Atomic Energy Agency | 131.1K | — | 2 |
| AS38635JP | KEIO-NET - Keio University | 131.1K | 2 | 4 |
| AS58647JP | KAGAWAU-AS - Kagawa University | 129.5K | — | 185 |
| AS58791JP | GMO-I-R2 - GMO Internet, Inc. | 128.5K | 8.2K | 183 |
| 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 |
| 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 |