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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.
1,300 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. | 4M | 236 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 2.8K |
| — |
| 4 |
| AS7663JP | FFNET - FUJI NEXTERA LABO INC. | 2.8K | — | 11 |
| AS58648JP | AT-I-NET - AT-I, Inc. | 2.8K | — | 7 |
| AS146976JP | KNET - Kvision Co.,Ltd. | 3.1K | 65.5K | 5 |
| AS152871JP | SANSO-NET - TAIYO NIPPON SANSO CORPORATION | 3.1K | — | 7 |
| AS58653JP | VolvoITJapan - UD Trucks Corporation, Volvo Information Technology Japan | 3.1K | — | 6 |
| AS23828JP | CHERRY-NET - Misaki Town | 3.1K | — | 2 |
| AS2515JP | JPNIC - Japan Network Information Center | 3.1K | 65.5K | 5 |
| 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 |
| AS131928JP | IPP-NET - Tottori Teletopia Co., Ltd. | 3.1K | — | 4 |
| AS151374JP | IWK-WORKS - IX-layers, Inc. | 3.3K | 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 |
| AS131950JP | ENJOYVC - EnjoyVC Japan Corporation | 3.6K | — | 11 |
| AS149428JP | CODE200-AS-AP - Code200, UAB | 3.6K | 131.1K | 15 |
| AS18127JP | Ibaraki - Ibaraki Prefectural Government | 3.6K | 65.5K | 16 |
| 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 |
| AS151373JP | JP3DP-NET - JAPAN 3D PRINTER | 3.8K | 2 | 16 |
| AS9990JP | NIandC - Nippon Information and Communication Corporation | 4.1K | — | 1 |
| AS18263JP | MEINET - MEITETSUCOM Co., Ltd. | 4.1K | — | 1 |
| AS38652JP | GINZADO-NET - Ginzado Co.,Ltd. | 4.1K | 65.5K | 2 |
| AS18074JP | FRT - FRT Inc. | 4.1K | 65.5K | 2 |
| AS18141JP | HBA-iDC - HBA | 4.1K | — | 1 |
| AS10016JP | MINC - Minaminihon Information Processing Center Co Ltd | 4.1K | — | 1 |
| AS23798JP | VRTC-NET - VR Techno Center,inc | 4.1K | — | 1 |
| AS18140JP | YAHOO-18140 - LY Corporation | 4.1K | — | 1 |
| AS24264JP | KANAZAWA-IT - Kanazawa Institute of Technology | 4.1K | — | 1 |
| AS45690JP | JCTV-NET - Nihon Central TV Co.,Inc. | 4.1K | — | 1 |
| AS131909JP | Okinawa-DC - OCC Co., Ltd. | 4.1K | — | 3 |
| AS150358JP | TWCU-NET - Tokyo Woman's Christian University | 4.1K | — | 3 |
| AS18272JP | BC-NET - Benesse Corporation | 4.1K | — | 11 |
| AS7513JP | SHIELD - Hitachi Systems, Ltd. | 4.1K | — | 12 |
| AS24477JP | NETAPPAS - NetApp, Inc. | 4.1K | 65.7K | 16 |
| AS23773JP | EKZM - EKZM co.,ltd. | 4.1K | — | 1 |
| AS17699JP | MEDiA - ARTERIA Networks Corporation | 4.1K | — | 1 |
| AS37898JP | BARTOK-NET - digitiminimi, inc. | 4.1K | — | 1 |
| AS45672JP | KGC-NET - Koga Cable TV Co., Ltd. | 4.1K | — | 1 |
| AS152861JP | CIT-NET - Chiba Institute of Technology | 4.1K | — | 1 |
| AS18143JP | DCSNET - Mitsubishi Research Institute DCS Co.,Ltd. | 4.1K | — | 1 |
| AS38633JP | VCIU-NET-AS - Value Core Inc. | 4.1K | 65.5K | 4 |
| AS63782JP | maotv - Omaezaki Cable Television Co.Ltd | 4.1K | 65.5K | 4 |
| AS131943JP | goto-tv - Goto tv | 4.1K | — | 4 |
| AS131929JP | FRUITSNET - Yamanashi CATV Co,. ltd | 4.1K | 65.5K | 4 |
| AS18383JP | CAHI-AS-JP - CAHI Corporation, | 4.1K | — | 1 |