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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 |
| 8.2K |
| — |
| 2 |
| AS23795JP | FURUKAWA - Fitec Corp. | 8.2K | — | 6 |
| AS23804JP | AIN-NET - Nonprofit Organization Kitaura Hana Net | 8.2K | — | 1 |
| AS23824JP | FUTURE - Future Spirits Co.,Ltd. | 8.2K | — | 3 |
| AS59102JP | GENES - GENES Co., Ltd. | 8.2K | — | 7 |
| AS7665JP | OKIX - Okayama Prefectural Government | 8.2K | 65.5K | 3 |
| AS9358JP | Finder - OPTAGE Inc. | 8.2K | — | 1 |
| AS17977JP | SINGTEL-JP - NF Park Bldg.3F, 9-15, Futaba 2-Chome | 8.2K | — | 2 |
| AS23817JP | KOCHI-IDC - Fujitsu Limited. | 8.2K | — | 2 |
| AS152868JP | THX-NET - THX Corp. | 8.2K | — | 31 |
| AS17678JP | WIND - Gunma Internet Co,.ltd | 8.2K | 65.5K | 3 |
| AS59096JP | MAIN - Meiji Gakuin University | 8.2K | — | 2 |
| AS17934JP | JGNv6 - National Institute of Information and Communications Technology | 8.4K | 114.7K | 14 |
| AS45691JP | DODO-CORE - DODO K.K. | 8.4K | 856.1K | 44 |
| AS5111JP | ALCL-AS-AP - Aibo Link Co., Ltd. | 8.4K | — | 2 |
| AS45680JP | DOVA-NET - DOVA Corporation | 8.4K | 65.5K | 9 |
| AS45687JP | MCT-Internet - Minamikyusyu CableTV Net Inc. | 8.7K | 65.5K | 7 |
| AS17940JP | CYBERLINKS - CYBER LINKS Co.,Ltd. | 8.7K | — | 4 |
| AS173JP | NTTECL-AS - Nippon Telegraph and Telephone Corporation | 8.7K | — | 2 |
| AS151387JP | OCTP-NET - OMURA CABLE TELEVISION K.K. | 8.7K | — | 3 |
| AS55912JP | u-kochi - University of Kochi | 8.7K | 65.5K | 7 |
| AS131970JP | Hikarinet - Hikarinet Inc. | 8.7K | 65.5K | 3 |
| AS37908JP | KBC - KIBI Cable Television Co.,Ltd. | 8.7K | 65.5K | 7 |
| AS18259JP | HIGE - NTT DOCOMO BUSINESS, Inc | 9K | 65.8K | 8 |
| AS63770JP | ICSCOE-AS - Industrial Cyber Security Center of Excellence | 9.2K | 69.6K | 13 |
| AS63798JP | IPA-ENTERNET - Industrial Cyber Security Center of Excellence | 9.2K | 768 | 4 |
| AS7664JP | HARENET - HARENET INC. | 9.2K | 65.5K | 3 |
| AS45677JP | ICV - Isahaya Cable Media Co.,Ltd | 9.2K | 65.5K | 5 |
| AS17689JP | H-IX - Hokuden Information Technology,Inc. | 9.7K | 65.5K | 6 |
| AS151375JP | HIMAWARI-NET - HimawariTV.Corporation | 9.7K | — | 3 |
| AS63784JP | GSS-NET - Digital Agency | 10K | 1M | 11 |
| AS131926JP | CTS-NET - Cable Television Saiki Co. , Ltd. | 10.2K | — | 4 |
| AS24289JP | KBN - Kagawa T.V Broadcast Network Co,.Ltd | 10.2K | 1 | 5 |
| AS23618JP | ICV-NET - Ibara Broadcasting Company | 10.2K | 65.5K | 6 |
| AS131933JP | TTV-NET - TAMA Television Co., Ltd | 10.2K | 65.5K | 6 |
| AS59126JP | NCT - NCT CO.,LTD. | 10.2K | 65.5K | 6 |
| AS7529JP | NETIRD - GMO NetIRD, Inc. | 10.8K | 65.5K | 10 |
| AS18526JP | DDPS - DDPS Networks, LLC | 10.8K | 162 | 37 |
| 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 | 938K | 66 |
| AS4695JP | URBAN - Enecom,Inc. | 12.3K | — | 2 |
| AS55388JP | ASJ - ASJ INC. | 12.3K | 65.5K | 3 |
| AS18266JP | ATNAP - Cable Networks Akita Co.,ltd. | 12.3K | 65.5K | 4 |
| AS17953JP | ICO - BroadBand Security, Inc. | 12.3K | 196.6K | 14 |
| AS18142JP | BIWALOBE - KISTEM Co., Ltd. | 12.3K | — | 2 |
| AS55385JP | DA - Digital Alliance Co.,Ltd. | 12.3K | 65.5K | 9 |