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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.
1,303 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. | 4.2M | 269 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| CAHI-AS-JP - CAHI Corporation, |
| 4.1K |
| — |
| 1 |
| AS23836JP | RELNET - RELATION Co., Ltd. | 4.1K | 65.5K | 3 |
| AS18074JP | FRT - FRT Inc. | 4.1K | 65.5K | 2 |
| AS45690JP | JCTV-NET - Nihon Central TV Co.,Inc. | 4.1K | — | 1 |
| AS212259JP | ASTRIX-EU Astrix Co., Ltd. | 4.1K | 131.1K | 30 |
| AS131943JP | goto-tv - Goto tv | 4.1K | — | 4 |
| AS24477JP | NETAPPAS - NetApp, Inc. | 4.1K | 65.7K | 16 |
| AS18141JP | HBA-iDC - HBA | 4.1K | — | 1 |
| AS151373JP | JP3DP-NET - JAPAN 3D PRINTER | 4.1K | 2 | 17 |
| AS24264JP | KANAZAWA-IT - Kanazawa Institute of Technology | 4.1K | — | 1 |
| AS17699JP | MEDiA - ARTERIA Networks Corporation | 4.1K | — | 1 |
| AS9990JP | NIandC - Nippon Information and Communication Corporation | 4.1K | — | 1 |
| AS131909JP | Okinawa-DC - OCC Co., Ltd. | 4.1K | — | 3 |
| AS7469JP | DODO_Broadband DODO K.K. | 4.1K | — | 2 |
| AS63782JP | maotv - Omaezaki Cable Television Co.Ltd | 4.1K | 65.5K | 4 |
| AS131929JP | FRUITSNET - Yamanashi CATV Co,. ltd | 4.1K | 65.5K | 4 |
| AS45672JP | KGC-NET - Koga Cable TV Co., Ltd. | 4.1K | — | 1 |
| AS38652JP | GINZADO-NET - Ginzado Co.,Ltd. | 4.1K | 65.5K | 2 |
| AS63783JP | CUC - Chiba University of Commerce | 4.1K | — | 3 |
| AS18140JP | YAHOO-18140 - LY Corporation | 4.1K | — | 1 |
| AS152861JP | CIT-NET - Chiba Institute of Technology | 4.1K | — | 1 |
| AS23798JP | VRTC-NET - VR Techno Center,inc | 4.1K | — | 1 |
| AS37898JP | BARTOK-NET - digitiminimi, inc. | 4.1K | — | 1 |
| AS18272JP | BC-NET - Benesse Corporation | 4.1K | — | 11 |
| AS18143JP | DCSNET - Mitsubishi Research Institute DCS Co.,Ltd. | 4.1K | — | 1 |
| AS18263JP | MEINET - MEITETSUCOM Co., Ltd. | 4.1K | — | 1 |
| AS23773JP | EKZM - EKZM co.,ltd. | 4.1K | — | 1 |
| AS10016JP | MINC - Minaminihon Information Processing Center Co Ltd | 4.1K | — | 1 |
| AS38633JP | VCIU-NET-AS - Value Core Inc. | 4.1K | 65.5K | 4 |
| AS7513JP | SHIELD - Hitachi Systems, Ltd. | 4.1K | — | 12 |
| AS150358JP | TWCU-NET - Tokyo Woman's Christian University | 4.1K | — | 3 |
| 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 |
| AS18127JP | Ibaraki - Ibaraki Prefectural Government | 3.6K | 65.5K | 16 |
| AS149428JP | CODE200-AS-AP - Code200, UAB | 3.6K | 131.1K | 15 |
| AS58653JP | VolvoITJapan - UD Trucks Corporation, Volvo Information Technology Japan | 3.6K | — | 7 |
| AS131950JP | ENJOYVC - EnjoyVC Japan Corporation | 3.6K | — | 11 |
| AS4697JP | NTTV6NET - Nippon Telegraph and Telephone Corporation | 3.3K | 65.5K | 8 |
| AS151195JP | NGIKK-AS-AP - Nova Global ICT Kabushiki Kaisha | 3.3K | — | 3 |
| AS151374JP | IWK-WORKS - IX-layers, Inc. | 3.3K | 65.5K | 4 |
| AS18090JP | MAGMA - IMS Corporation | 3.1K | — | 2 |
| AS23616JP | HNB - Hitachi Systems, Ltd. | 3.1K | 65.5K | 4 |
| AS23828JP | CHERRY-NET - Misaki Town | 3.1K | — | 2 |
| AS152871JP | SANSO-NET - TAIYO NIPPON SANSO CORPORATION | 3.1K | — | 7 |
| AS2515JP | JPNIC - Japan Network Information Center | 3.1K | 65.5K | 5 |
| AS211252JP | AKARI-AS-JP Marushin K.K. | 3.1K | — | 6 |
| AS131928JP | IPP-NET - Tottori Teletopia Co., Ltd. | 3.1K | — | 4 |