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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 |
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| — |
| 0 |
| AS151035JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS150355JP | BBIX-MAPSRS - BBIX,Inc. | — | — | 0 |
| AS59099JP | CLOUD-SDN-AS - BroadBand Tower, Inc. | — | — | 0 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | — | — | 0 |
| AS63787JP | AS63787-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37913JP | AS37913-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23792JP | AS23792-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS136796JP | CL-JP-AS - CORELINK JAPAN | — | — | 0 |
| AS23636JP | AS23636-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38653JP | JAPANPOST - JAPAN POST HOLDINGS Co., Ltd. | — | — | 0 |
| AS46953JP | INCLEAF - FENGYE INC | — | — | 0 |
| AS17702JP | AS17702-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10017JP | AS10017-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23823JP | AS23823-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18122JP | KYOTO-IX - Advanced Software Technology & Management Research Institute of KYOTO | — | — | 0 |
| AS2521JP | AS2521-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37981JP | TYIS-AS-AP - TOYO Internet Service Co., Ltd. | — | — | 0 |
| AS24297JP | FCN - University Public Corporation Osaka | — | — | 0 |
| AS7526JP | MIND-US - Mitsubishi Electric Information Network Corporation | — | — | 0 |
| AS23835JP | AS23835-63 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23796JP | AS23796-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17526JP | AS17526-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18082JP | LASDEC - Japan Agency for Local Authority Information Systems | — | — | 0 |
| AS18079JP | AS18079-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9610JP | AS9610-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4716JP | POWEREDCOM - KDDI CORPORATION | — | — | 0 |
| AS18086JP | PFU-IDC - PFU LIMITED | — | — | 0 |
| AS18085JP | INFOVALLEY - Fujitsu Systems Applications & Support Limited | — | — | 0 |
| AS400593JP | TRIDATA - tricloud | — | — | 0 |
| AS18084JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS17507JP | AS17507-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151034JP | TAO_MUMBAI3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS132373JP | ASIAN-WEB-JP - Neomet Aoyama BLDG.3F 2-7-13 Shibuya | — | — | 0 |
| AS9363JP | FNETS - FUJITSU NETWORK SOLUTIONS LIMITED | — | — | 0 |
| AS17942JP | AS17942-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10026JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS4672JP | AS4672-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4705JP | AS4705-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152862JP | SOLTIEND - Shiojiri City | — | — | 0 |
| AS151016JP | TAO_DALLAS - AT&T TAO Cloud Access Node | — | — | 0 |
| AS134703JP | JCIX - Japan Community IX Association | — | — | 0 |
| AS4692JP | INTERGATE - InternetWare Co., LTD. | — | — | 0 |
| AS131084JP | MKInet-JP - MKI Network Solutions, Ltd. | — | — | 0 |
| AS59113JP | RJV6-NET - RICOH JAPAN Corporation | — | — | 0 |
| AS9349JP | AS9349-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59112JP | PLUSONE - Plus One marketing Ltd. | — | — | 0 |