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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 |
| 4.1K |
| — |
| 1 |
| AS18383JP | CAHI-AS-JP - CAHI Corporation, | 4.1K | — | 1 |
| AS150358JP | TWCU-NET - Tokyo Woman's Christian University | 4.1K | — | 3 |
| AS18074JP | FRT - FRT Inc. | 4.1K | 65.5K | 2 |
| AS37898JP | BARTOK-NET - digitiminimi, inc. | 4.1K | — | 1 |
| AS38627JP | BAIDUJP - Baidu, Inc. | 4.1K | — | 9 |
| AS7513JP | SHIELD - Hitachi Systems, Ltd. | 4.1K | — | 12 |
| AS131909JP | Okinawa-DC - OCC Co., Ltd. | 4.1K | — | 3 |
| AS9990JP | NIandC - Nippon Information and Communication Corporation | 4.1K | — | 1 |
| AS24477JP | NETAPPAS - NetApp, Inc. | 4.1K | 65.7K | 16 |
| AS24264JP | KANAZAWA-IT - Kanazawa Institute of Technology | 4.1K | — | 1 |
| AS45672JP | KGC-NET - Koga Cable TV Co., Ltd. | 4.1K | — | 1 |
| AS18272JP | BC-NET - Benesse Corporation | 4.1K | — | 11 |
| AS10016JP | MINC - Minaminihon Information Processing Center Co Ltd | 4.1K | — | 1 |
| AS18263JP | MEINET - MEITETSUCOM Co., Ltd. | 4.1K | — | 1 |
| AS17699JP | MEDiA - ARTERIA Networks Corporation | 4.1K | — | 1 |
| AS18140JP | YAHOO-18140 - LY Corporation | 4.1K | — | 1 |
| AS18143JP | DCSNET - Mitsubishi Research Institute DCS Co.,Ltd. | 4.1K | — | 1 |
| AS131929JP | FRUITSNET - Yamanashi CATV Co,. ltd | 4.1K | 65.5K | 4 |
| AS38633JP | VCIU-NET-AS - Value Core Inc. | 4.1K | — | 3 |
| AS45690JP | JCTV-NET - Nihon Central TV Co.,Inc. | 4.1K | — | 1 |
| AS63782JP | maotv - Omaezaki Cable Television Co.Ltd | 4.1K | 65.5K | 4 |
| AS23836JP | RELNET - RELATION Co., Ltd. | 4.1K | 65.5K | 3 |
| AS131943JP | goto-tv - Goto tv | 4.1K | — | 4 |
| AS37891JP | JTIS - JR TOKAI Information Systems Company | 3.8K | — | 8 |
| AS45688JP | UT-NSRG - The University of Tokyo Interfaculty Initiative in Information Studies | 3.6K | — | 7 |
| AS131950JP | ENJOYVC - EnjoyVC Japan Corporation | 3.6K | — | 11 |
| AS151373JP | JP3DP-NET - JAPAN 3D PRINTER | 3.6K | 2 | 15 |
| AS149428JP | CODE200-AS-AP - Code200, UAB | 3.6K | 131.1K | 15 |
| AS63793JP | OPSBETTER - Japan OPS Better Co., Ltd. | 3.6K | 65.5K | 14 |
| AS18127JP | Ibaraki - Ibaraki Prefectural Government | 3.6K | 65.5K | 16 |
| AS151374JP | IWK-WORKS - IX-layers, Inc. | 3.3K | 65.5K | 4 |
| AS58653JP | VolvoITJapan - UD Trucks Corporation, Volvo Information Technology Japan | 3.3K | — | 7 |
| AS45680JP | DOVA-NET - DOVA Corporation | 3.3K | 65.5K | 7 |
| AS4697JP | NTTV6NET - Nippon Telegraph and Telephone Corporation | 3.3K | 65.5K | 8 |
| AS23828JP | CHERRY-NET - Misaki Town | 3.1K | — | 2 |
| AS2515JP | JPNIC - Japan Network Information Center | 3.1K | 65.5K | 5 |
| AS131928JP | IPP-NET - Tottori Teletopia Co., Ltd. | 3.1K | — | 4 |
| AS146976JP | KNET - Kvision Co.,Ltd. | 3.1K | 65.5K | 5 |
| AS152871JP | SANSO-NET - TAIYO NIPPON SANSO CORPORATION | 3.1K | — | 7 |
| AS23616JP | HNB - Hitachi Systems, Ltd. | 3.1K | 65.5K | 4 |
| AS18090JP | MAGMA - IMS Corporation | 3.1K | — | 2 |
| AS59093JP | ICKNET - IMABARI CATV CORPORATION | 3.1K | 1 | 3 |
| AS24286JP | WNI-AS - Weathernews,Inc. | 2.8K | — | 4 |
| AS131957JP | MicroAd - MicroAd, Inc. | 2.8K | 65.5K | 6 |
| AS58648JP | AT-I-NET - AT-I, Inc. | 2.8K | — | 7 |
| AS136796JP | CL-JP-AS - CORELINK JAPAN | 2.8K | 4 | 12 |