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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
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 |
| 12.3K |
| — |
| 2 |
| AS23630JP | CAC-NET - CAC Inc. | 12.3K | — | 5 |
| AS17953JP | ICO - BroadBand Security, Inc. | 12.3K | 196.6K | 14 |
| AS55388JP | ASJ - ASJ INC. | 12.3K | 65.5K | 3 |
| AS17661JP | NHN-JAPAN - NHN Cloud Japan Corporation | 11.5K | — | 25 |
| AS24336JP | DIGITALBANK-JP - DIGITALBANK, Inc., Regional ISP in Japan | 11.3K | — | 13 |
| AS4785JP | XTOM-AS-JP - xTom | 10.8K | 938K | 62 |
| AS7529JP | NETIRD - GMO NetIRD, Inc. | 10.8K | 65.5K | 10 |
| AS131933JP | TTV-NET - TAMA Television Co., Ltd | 10.2K | 65.5K | 6 |
| AS138968JP | RAINBOWIDC-AS-AP - rainbow network limited | 10.2K | 589.8K | 24 |
| AS59126JP | NCT - NCT CO.,LTD. | 10.2K | 65.5K | 6 |
| AS18526JP | DDPS - DDPS Networks, LLC | 10.2K | 161 | 34 |
| AS131926JP | CTS-NET - Cable Television Saiki Co. , Ltd. | 10.2K | — | 4 |
| AS23618JP | ICV-NET - Ibara Broadcasting Company | 10.2K | 65.5K | 6 |
| AS24289JP | KBN - Kagawa T.V Broadcast Network Co,.Ltd | 10.2K | 1 | 5 |
| AS63784JP | GSS-NET - Digital Agency | 10K | 1M | 11 |
| AS23967JP | PoD - Produce On Demand Inc. Streaming Contents Delivery Service Tokyo | 10K | — | 7 |
| AS151375JP | HIMAWARI-NET - HimawariTV.Corporation | 9.7K | — | 3 |
| AS17689JP | H-IX - Hokuden Information Technology,Inc. | 9.7K | 65.5K | 6 |
| AS63798JP | IPA-ENTERNET - Industrial Cyber Security Center of Excellence | 9.2K | 768 | 4 |
| AS142622JP | DIL-AS-AP - Dream Information Laboratory | 9.2K | 524.3K | 37 |
| AS45677JP | ICV - Isahaya Cable Media Co.,Ltd | 9.2K | 65.5K | 5 |
| AS63770JP | ICSCOE-AS - Industrial Cyber Security Center of Excellence | 9.2K | 69.6K | 13 |
| AS7664JP | HARENET - HARENET INC. | 9.2K | 65.5K | 3 |
| AS18259JP | HIGE - NTT DOCOMO BUSINESS, Inc | 9K | 65.8K | 8 |
| AS173JP | NTTECL-AS - Nippon Telegraph and Telephone Corporation | 8.7K | — | 2 |
| AS37908JP | KBC - KIBI Cable Television Co.,Ltd. | 8.7K | 65.5K | 7 |
| AS151387JP | OCTP-NET - OMURA CABLE TELEVISION K.K. | 8.7K | — | 3 |
| AS17940JP | CYBERLINKS - CYBER LINKS Co.,Ltd. | 8.7K | — | 4 |
| AS131970JP | Hikarinet - Hikarinet Inc. | 8.7K | 65.5K | 3 |
| AS45687JP | MCT-Internet - Minamikyusyu CableTV Net Inc. | 8.7K | 65.5K | 7 |
| AS45691JP | DODO-CORE - DODO K.K. | 8.4K | 202K | 41 |
| AS55912JP | u-kochi - University of Kochi | 8.4K | 65.5K | 6 |
| AS23817JP | KOCHI-IDC - Fujitsu Limited. | 8.4K | — | 3 |
| AS59102JP | GENES - GENES Co., Ltd. | 8.2K | — | 7 |
| AS7686JP | ATNETHOME - JCOM Co., Ltd. | 8.2K | — | 2 |
| AS59091JP | KAIT-NWLAB - Kanagawa Institute of Technology | 8.2K | — | 1 |
| AS23824JP | FUTURE - Future Spirits Co.,Ltd. | 8.2K | — | 3 |
| AS17977JP | SINGTEL-JP - NF Park Bldg.3F, 9-15, Futaba 2-Chome | 8.2K | — | 2 |
| AS7678JP | PROX - Prox System Design Inc. | 8.2K | — | 2 |
| AS23795JP | FURUKAWA - Fitec Corp. | 8.2K | — | 6 |
| AS9358JP | Finder - OPTAGE Inc. | 8.2K | — | 1 |
| AS7665JP | OKIX - Okayama Prefectural Government | 8.2K | 65.5K | 3 |
| AS17518JP | SHIOJIRI - Shiojiri City | 8.2K | — | 1 |
| AS23804JP | AIN-NET - Nonprofit Organization Kitaura Hana Net | 8.2K | — | 1 |
| AS17678JP | WIND - Gunma Internet Co,.ltd | 8.2K | 65.5K | 3 |
| AS45675JP | KMN-TOKYO - JCOM Co., Ltd. | 8.2K | — | 3 |