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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 | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
| 3.1K |
| — |
| 2 |
| AS23616JP | HNB - Hitachi Systems, Ltd. | 3.1K | 65.5K | 4 |
| AS151389JP | Synergy-net - Synergy Cross Corporation | 3.1K | — | 12 |
| AS152871JP | SANSO-NET - TAIYO NIPPON SANSO CORPORATION | 3.1K | — | 7 |
| AS131928JP | IPP-NET - Tottori Teletopia Co., Ltd. | 3.1K | — | 4 |
| AS2515JP | JPNIC - Japan Network Information Center | 3.1K | 65.5K | 5 |
| AS4697JP | NTTV6NET - Nippon Telegraph and Telephone Corporation | 3.3K | 65.5K | 8 |
| AS45680JP | DOVA-NET - DOVA Corporation | 3.3K | 65.5K | 7 |
| AS151374JP | IWK-WORKS - IX-layers, Inc. | 3.3K | 65.5K | 4 |
| AS58653JP | VolvoITJapan - UD Trucks Corporation, Volvo Information Technology Japan | 3.3K | — | 7 |
| AS131950JP | ENJOYVC - EnjoyVC Japan Corporation | 3.6K | — | 11 |
| AS18127JP | Ibaraki - Ibaraki Prefectural Government | 3.6K | 65.5K | 16 |
| AS149428JP | CODE200-AS-AP - Code200, UAB | 3.6K | 131.1K | 15 |
| AS151373JP | JP3DP-NET - JAPAN 3D PRINTER | 3.6K | 2 | 15 |
| AS45688JP | UT-NSRG - The University of Tokyo Interfaculty Initiative in Information Studies | 3.6K | — | 7 |
| AS37891JP | JTIS - JR TOKAI Information Systems Company | 3.8K | — | 8 |
| AS38652JP | GINZADO-NET - Ginzado Co.,Ltd. | 4.1K | 65.5K | 2 |
| AS63783JP | CUC - Chiba University of Commerce | 4.1K | — | 3 |
| AS7513JP | SHIELD - Hitachi Systems, Ltd. | 4.1K | — | 12 |
| AS18272JP | BC-NET - Benesse Corporation | 4.1K | — | 11 |
| AS45672JP | KGC-NET - Koga Cable TV Co., Ltd. | 4.1K | — | 1 |
| AS45690JP | JCTV-NET - Nihon Central TV Co.,Inc. | 4.1K | — | 1 |
| AS18383JP | CAHI-AS-JP - CAHI Corporation, | 4.1K | — | 1 |
| AS9990JP | NIandC - Nippon Information and Communication Corporation | 4.1K | — | 1 |
| AS18074JP | FRT - FRT Inc. | 4.1K | 65.5K | 2 |
| AS38633JP | VCIU-NET-AS - Value Core Inc. | 4.1K | — | 3 |
| AS17699JP | MEDiA - ARTERIA Networks Corporation | 4.1K | — | 1 |
| AS24477JP | NETAPPAS - NetApp, Inc. | 4.1K | 65.7K | 16 |
| AS23798JP | VRTC-NET - VR Techno Center,inc | 4.1K | — | 1 |
| AS18263JP | MEINET - MEITETSUCOM Co., Ltd. | 4.1K | — | 1 |
| AS152861JP | CIT-NET - Chiba Institute of Technology | 4.1K | — | 1 |
| AS23773JP | EKZM - EKZM co.,ltd. | 4.1K | — | 1 |
| AS150358JP | TWCU-NET - Tokyo Woman's Christian University | 4.1K | — | 3 |
| AS24264JP | KANAZAWA-IT - Kanazawa Institute of Technology | 4.1K | — | 1 |
| AS10016JP | MINC - Minaminihon Information Processing Center Co Ltd | 4.1K | — | 1 |
| AS18141JP | HBA-iDC - HBA | 4.1K | — | 1 |
| AS18143JP | DCSNET - Mitsubishi Research Institute DCS Co.,Ltd. | 4.1K | — | 1 |
| AS18140JP | YAHOO-18140 - LY Corporation | 4.1K | — | 1 |
| AS63782JP | maotv - Omaezaki Cable Television Co.Ltd | 4.1K | 65.5K | 4 |
| AS131943JP | goto-tv - Goto tv | 4.1K | — | 4 |
| AS23836JP | RELNET - RELATION Co., Ltd. | 4.1K | 65.5K | 3 |
| AS131929JP | FRUITSNET - Yamanashi CATV Co,. ltd | 4.1K | 65.5K | 4 |
| AS131909JP | Okinawa-DC - OCC Co., Ltd. | 4.1K | — | 3 |
| AS37898JP | BARTOK-NET - digitiminimi, inc. | 4.1K | — | 1 |
| AS38627JP | BAIDUJP - Baidu, Inc. | 4.1K | — | 9 |
| AS37914JP | Univnet - Advanced Software Technology and Management Research Institute of KYOTO | 4.4K | — | 2 |
| AS55897JP | SAKURA-F - SAKURA Internet Inc. | 4.4K | — | 2 |