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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 |
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| 0 |
| AS4692JP | INTERGATE - InternetWare Co., LTD. | — | — | 0 |
| AS59112JP | PLUSONE - Plus One marketing Ltd. | — | — | 0 |
| AS38653JP | JAPANPOST - JAPAN POST HOLDINGS Co., Ltd. | — | — | 0 |
| AS63788JP | MOCHIYA-NET - MOCHIYA Inc. | — | — | 0 |
| AS63787JP | AS63787-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17702JP | AS17702-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9363JP | FNETS - FUJITSU NETWORK SOLUTIONS LIMITED | — | — | 0 |
| AS7507JP | AS7507-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9992JP | AS9992-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4687JP | AS4687-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS2502JP | TRAIN - The University of Tokyo | — | — | 0 |
| AS4705JP | AS4705-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131084JP | MKInet-JP - MKI Network Solutions, Ltd. | — | — | 0 |
| AS150355JP | BBIX-MAPSRS - BBIX,Inc. | — | — | 0 |
| AS23636JP | AS23636-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18285JP | AS18285-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4719JP | J-Stream-4 - J-Stream Inc. | — | — | 0 |
| AS17526JP | AS17526-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151602JP | UTC-AS-AP - UD Trucks Corporation | — | — | 0 |
| AS23821JP | AS23821-49 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17930JP | AS17930-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131908JP | Intec-DCAN - INTEC Inc. | — | — | 0 |
| AS152467JP | ETS-AS-AP - ETS TELECOM ETS TELCO | — | — | 0 |
| AS151015JP | TAO_FRANKFURT - AT&T TAO Cloud Access Node | — | — | 0 |
| AS146970JP | BBS - BBSakura Networks, Inc. | — | — | 0 |
| AS4701JP | AS4701-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10026JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS2521JP | AS2521-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152862JP | SOLTIEND - Shiojiri City | — | — | 0 |
| AS58646JP | FBDC-B - FreeBit Co.,Ltd. | — | — | 0 |
| AS59100JP | kochi-gc - Kochi Gakuen College | — | — | 0 |
| AS37920JP | AS37920-33 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37909JP | IKUEIKAN-NET - Ikueikan University | — | — | 0 |
| AS23806JP | HBS - Chupicom Inc. | — | — | 0 |
| AS199767JP | DOVE-AS Pinjia Zhao | — | 256 | 1 |
| AS45676JP | AS45676-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37927JP | NOMURATRADE - Nomura Researth Institute, Ltd. | — | — | 0 |
| AS9592JP | PRISM - SOFTBANK TELECOM Corp. | — | — | 0 |
| AS10007JP | IPR - SoftBank Corp. | — | — | 0 |
| AS7661JP | AS7661-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS140868JP | TAKATASDCC-AS-AP - TakataSDCC Net | — | 2 | 2 |
| AS18067JP | HUMEIA - Humeia Corporation | — | — | 0 |
| AS23789JP | AS23789-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9599JP | INFOPEPPER - EJWORKS CORPORATION | — | — | 0 |
| AS9356JP | AS9356-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS2520JP | AS2520-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |