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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 |
| 3.1K |
| 65.5K |
| 5 |
| AS58653JP | VolvoITJapan - UD Trucks Corporation, Volvo Information Technology Japan | 3.1K | — | 6 |
| AS59093JP | ICKNET - IMABARI CATV CORPORATION | 3.1K | 1 | 3 |
| AS152871JP | SANSO-NET - TAIYO NIPPON SANSO CORPORATION | 3.1K | — | 7 |
| AS23828JP | CHERRY-NET - Misaki Town | 3.1K | — | 2 |
| AS131928JP | IPP-NET - Tottori Teletopia Co., Ltd. | 3.1K | — | 4 |
| AS23616JP | HNB - Hitachi Systems, Ltd. | 3.1K | 65.5K | 4 |
| AS45680JP | DOVA-NET - DOVA Corporation | 3.3K | 65.5K | 7 |
| AS4697JP | NTTV6NET - Nippon Telegraph and Telephone Corporation | 3.3K | 65.5K | 8 |
| AS151374JP | IWK-WORKS - IX-layers, Inc. | 3.3K | 65.5K | 4 |
| AS149428JP | CODE200-AS-AP - Code200, UAB | 3.6K | 131.1K | 15 |
| AS18127JP | Ibaraki - Ibaraki Prefectural Government | 3.6K | 65.5K | 16 |
| AS131950JP | ENJOYVC - EnjoyVC Japan Corporation | 3.6K | — | 11 |
| 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 |
| AS18141JP | HBA-iDC - HBA | 4.1K | — | 1 |
| AS7513JP | SHIELD - Hitachi Systems, Ltd. | 4.1K | — | 12 |
| AS18272JP | BC-NET - Benesse Corporation | 4.1K | — | 11 |
| AS38633JP | VCIU-NET-AS - Value Core Inc. | 4.1K | — | 3 |
| AS63782JP | maotv - Omaezaki Cable Television Co.Ltd | 4.1K | 65.5K | 4 |
| AS4695JP | URBAN - Enecom,Inc. | 4.1K | — | 1 |
| AS9990JP | NIandC - Nippon Information and Communication Corporation | 4.1K | — | 1 |
| AS24264JP | KANAZAWA-IT - Kanazawa Institute of Technology | 4.1K | — | 1 |
| AS150358JP | TWCU-NET - Tokyo Woman's Christian University | 4.1K | — | 3 |
| AS18143JP | DCSNET - Mitsubishi Research Institute DCS Co.,Ltd. | 4.1K | — | 1 |
| AS23836JP | RELNET - RELATION Co., Ltd. | 4.1K | 65.5K | 3 |
| AS17699JP | MEDiA - ARTERIA Networks Corporation | 4.1K | — | 1 |
| AS24477JP | NETAPPAS - NetApp, Inc. | 4.1K | 65.7K | 16 |
| AS37898JP | BARTOK-NET - digitiminimi, inc. | 4.1K | — | 1 |
| AS131943JP | goto-tv - Goto tv | 4.1K | — | 4 |
| AS38652JP | GINZADO-NET - Ginzado Co.,Ltd. | 4.1K | 65.5K | 2 |
| AS131929JP | FRUITSNET - Yamanashi CATV Co,. ltd | 4.1K | 65.5K | 4 |
| AS18140JP | YAHOO-18140 - LY Corporation | 4.1K | — | 1 |
| AS23798JP | VRTC-NET - VR Techno Center,inc | 4.1K | — | 1 |
| AS23773JP | EKZM - EKZM co.,ltd. | 4.1K | — | 1 |
| AS18383JP | CAHI-AS-JP - CAHI Corporation, | 4.1K | — | 1 |
| AS10016JP | MINC - Minaminihon Information Processing Center Co Ltd | 4.1K | — | 1 |
| AS152861JP | CIT-NET - Chiba Institute of Technology | 4.1K | — | 1 |
| AS45672JP | KGC-NET - Koga Cable TV Co., Ltd. | 4.1K | — | 1 |
| AS18263JP | MEINET - MEITETSUCOM Co., Ltd. | 4.1K | — | 1 |
| AS18074JP | FRT - FRT Inc. | 4.1K | 65.5K | 2 |
| AS45690JP | JCTV-NET - Nihon Central TV Co.,Inc. | 4.1K | — | 1 |
| AS131909JP | Okinawa-DC - OCC Co., Ltd. | 4.1K | — | 3 |
| AS55897JP | SAKURA-F - SAKURA Internet Inc. | 4.4K | — | 2 |
| AS131899JP | DIG-NET - DIG Inc. | 4.4K | — | 11 |
| AS37914JP | Univnet - Advanced Software Technology and Management Research Institute of KYOTO | 4.4K | — | 2 |