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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 |
| 8.2K |
| — |
| 1 |
| AS17518JP | SHIOJIRI - Shiojiri City | 8.2K | — | 1 |
| AS45675JP | KMN-TOKYO - JCOM Co., Ltd. | 8.2K | — | 3 |
| AS45689JP | CONVIVIALNET - Convivial Net | 8.2K | 1 | 3 |
| AS7665JP | OKIX - Okayama Prefectural Government | 8.2K | 65.5K | 3 |
| AS7686JP | ATNETHOME - JCOM Co., Ltd. | 8.2K | — | 2 |
| AS23817JP | KOCHI-IDC - Fujitsu Limited. | 8.2K | — | 2 |
| AS23804JP | AIN-NET - Nonprofit Organization Kitaura Hana Net | 8.2K | — | 1 |
| AS17934JP | JGNv6 - National Institute of Information and Communications Technology | 8.2K | 114.7K | 14 |
| AS59102JP | GENES - GENES Co., Ltd. | 8.2K | — | 7 |
| AS55912JP | u-kochi - University of Kochi | 8.4K | 65.5K | 6 |
| AS45691JP | DODO-CORE - DODO K.K. | 8.4K | 857.3K | 45 |
| AS131970JP | Hikarinet - Hikarinet Inc. | 8.7K | 65.5K | 3 |
| AS151387JP | OCTP-NET - OMURA CABLE TELEVISION K.K. | 8.7K | — | 3 |
| AS37908JP | KBC - KIBI Cable Television Co.,Ltd. | 8.7K | 65.5K | 7 |
| AS173JP | NTTECL-AS - Nippon Telegraph and Telephone Corporation | 8.7K | — | 2 |
| AS45687JP | MCT-Internet - Minamikyusyu CableTV Net Inc. | 8.7K | 65.5K | 7 |
| AS17940JP | CYBERLINKS - CYBER LINKS Co.,Ltd. | 8.7K | — | 4 |
| AS18259JP | HIGE - NTT DOCOMO BUSINESS, Inc | 9K | 65.8K | 8 |
| AS63770JP | ICSCOE-AS - Industrial Cyber Security Center of Excellence | 9.2K | 69.6K | 13 |
| AS45677JP | ICV - Isahaya Cable Media Co.,Ltd | 9.2K | 65.5K | 5 |
| AS7664JP | HARENET - HARENET INC. | 9.2K | 65.5K | 3 |
| AS63798JP | IPA-ENTERNET - Industrial Cyber Security Center of Excellence | 9.2K | 768 | 4 |
| AS138968JP | RAINBOWIDC-AS-AP - rainbow network limited | 9.5K | 589.8K | 22 |
| AS151375JP | HIMAWARI-NET - HimawariTV.Corporation | 9.7K | — | 3 |
| AS17689JP | H-IX - Hokuden Information Technology,Inc. | 9.7K | 65.5K | 6 |
| AS63784JP | GSS-NET - Digital Agency | 10K | 1M | 11 |
| AS131926JP | CTS-NET - Cable Television Saiki Co. , Ltd. | 10.2K | — | 4 |
| AS131933JP | TTV-NET - TAMA Television Co., Ltd | 10.2K | 65.5K | 6 |
| AS23618JP | ICV-NET - Ibara Broadcasting Company | 10.2K | 65.5K | 6 |
| AS24289JP | KBN - Kagawa T.V Broadcast Network Co,.Ltd | 10.2K | 1 | 5 |
| AS59126JP | NCT - NCT CO.,LTD. | 10.2K | 65.5K | 6 |
| AS18526JP | DDPS - DDPS Networks, LLC | 10.5K | 162 | 36 |
| AS7529JP | NETIRD - GMO NetIRD, Inc. | 10.8K | 65.5K | 10 |
| AS24336JP | DIGITALBANK-JP - DIGITALBANK, Inc., Regional ISP in Japan | 11.3K | — | 13 |
| AS17661JP | NHN-JAPAN - NHN Cloud Japan Corporation | 11.5K | — | 25 |
| AS4785JP | XTOM-AS-JP - xTom | 11.8K | 872.5K | 65 |
| AS23630JP | CAC-NET - CAC Inc. | 12.3K | — | 5 |
| AS17953JP | ICO - BroadBand Security, Inc. | 12.3K | 196.6K | 14 |
| AS18266JP | ATNAP - Cable Networks Akita Co.,ltd. | 12.3K | 65.5K | 4 |
| AS55385JP | DA - Digital Alliance Co.,Ltd. | 12.3K | 65.5K | 9 |
| AS55388JP | ASJ - ASJ INC. | 12.3K | 65.5K | 3 |
| AS18142JP | BIWALOBE - KISTEM Co., Ltd. | 12.3K | — | 2 |
| AS23628JP | ACCSnet - Academic newtown Community Cable Service | 12.3K | 65.5K | 3 |
| AS17505JP | SBmobile - SoftBank Corp. | 12.8K | — | 20 |
| AS23639JP | ntt-bizlink - NTT Bizlink, Inc. | 12.8K | 65.5K | 14 |
| AS18070JP | NDAC - Global Network Core Co.,Ltd. | 13.3K | 65.5K | 6 |