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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 |
| 4.1K |
| 65.5K |
| 4 |
| AS131943JP | goto-tv - Goto tv | 4.1K | — | 4 |
| AS38652JP | GINZADO-NET - Ginzado Co.,Ltd. | 4.1K | 65.5K | 2 |
| AS38633JP | VCIU-NET-AS - Value Core Inc. | 4.1K | — | 3 |
| AS131909JP | Okinawa-DC - OCC Co., Ltd. | 4.1K | — | 3 |
| AS131929JP | FRUITSNET - Yamanashi CATV Co,. ltd | 4.1K | 65.5K | 4 |
| AS18074JP | FRT - FRT Inc. | 4.1K | 65.5K | 2 |
| AS18140JP | YAHOO-18140 - LY Corporation | 4.1K | — | 1 |
| AS10016JP | MINC - Minaminihon Information Processing Center Co Ltd | 4.1K | — | 1 |
| AS23773JP | EKZM - EKZM co.,ltd. | 4.1K | — | 1 |
| AS18272JP | BC-NET - Benesse Corporation | 4.1K | — | 11 |
| AS24477JP | NETAPPAS - NetApp, Inc. | 4.1K | 65.7K | 16 |
| AS152861JP | CIT-NET - Chiba Institute of Technology | 4.1K | — | 1 |
| AS18383JP | CAHI-AS-JP - CAHI Corporation, | 4.1K | — | 1 |
| AS18143JP | DCSNET - Mitsubishi Research Institute DCS Co.,Ltd. | 4.1K | — | 1 |
| AS18263JP | MEINET - MEITETSUCOM Co., Ltd. | 4.1K | — | 1 |
| AS23836JP | RELNET - RELATION Co., Ltd. | 4.1K | 65.5K | 3 |
| AS45690JP | JCTV-NET - Nihon Central TV Co.,Inc. | 4.1K | — | 1 |
| AS7513JP | SHIELD - Hitachi Systems, Ltd. | 4.1K | — | 12 |
| AS37898JP | BARTOK-NET - digitiminimi, inc. | 4.1K | — | 1 |
| AS150358JP | TWCU-NET - Tokyo Woman's Christian University | 4.1K | — | 3 |
| AS9990JP | NIandC - Nippon Information and Communication Corporation | 4.1K | — | 1 |
| AS4695JP | URBAN - Enecom,Inc. | 4.1K | — | 1 |
| AS23798JP | VRTC-NET - VR Techno Center,inc | 4.1K | — | 1 |
| AS45672JP | KGC-NET - Koga Cable TV Co., Ltd. | 4.1K | — | 1 |
| 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 |
| 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 |
| AS45680JP | DOVA-NET - DOVA Corporation | 3.3K | 65.5K | 7 |
| AS151374JP | IWK-WORKS - IX-layers, Inc. | 3.3K | 65.5K | 4 |
| AS4697JP | NTTV6NET - Nippon Telegraph and Telephone Corporation | 3.3K | 65.5K | 8 |
| AS131928JP | IPP-NET - Tottori Teletopia Co., Ltd. | 3.1K | — | 4 |
| AS2515JP | JPNIC - Japan Network Information Center | 3.1K | 65.5K | 5 |
| AS58653JP | VolvoITJapan - UD Trucks Corporation, Volvo Information Technology Japan | 3.1K | — | 6 |
| AS152871JP | SANSO-NET - TAIYO NIPPON SANSO CORPORATION | 3.1K | — | 7 |
| AS59093JP | ICKNET - IMABARI CATV CORPORATION | 3.1K | 1 | 3 |
| AS18090JP | MAGMA - IMS Corporation | 3.1K | — | 2 |
| AS146976JP | KNET - Kvision Co.,Ltd. | 3.1K | 65.5K | 5 |
| AS23616JP | HNB - Hitachi Systems, Ltd. | 3.1K | 65.5K | 4 |
| AS23828JP | CHERRY-NET - Misaki Town | 3.1K | — | 2 |
| AS58648JP | AT-I-NET - AT-I, Inc. | 2.8K | — | 7 |
| AS7663JP | FFNET - FUJI NEXTERA LABO INC. | 2.8K | — | 11 |
| AS131957JP | MicroAd - MicroAd, Inc. | 2.8K | 65.5K | 6 |
| AS24286JP | WNI-AS - Weathernews,Inc. | 2.8K | — | 4 |