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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 |
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| — |
| 0 |
| AS4692JP | INTERGATE - InternetWare Co., LTD. | — | — | 0 |
| AS131084JP | MKInet-JP - MKI Network Solutions, Ltd. | — | — | 0 |
| AS58792JP | closip-1 - closip Inc. | — | — | 0 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | — | — | 0 |
| AS136796JP | CL-JP-AS - CORELINK JAPAN | — | — | 0 |
| AS23806JP | HBS - Chupicom Inc. | — | — | 0 |
| AS10007JP | IPR - SoftBank Corp. | — | — | 0 |
| AS7525JP | AS7525-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23748JP | CAT-AS-AP - Cat Networks K.K. | — | — | 0 |
| AS4699JP | AS4699-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS2524JP | RIM - EJWORKS CORPORATION | — | — | 0 |
| AS4705JP | AS4705-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151037JP | TAO_BEIJING - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151602JP | UTC-AS-AP - UD Trucks Corporation | — | — | 0 |
| AS37903JP | AS37903-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23789JP | AS23789-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7515JP | GIN-NTTLJ - NTT Ltd Japan Corporation | — | — | 0 |
| AS17526JP | AS17526-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4703JP | AS4703-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS32340JP | ZEN-BACKBONE - ZenWalk | — | — | 0 |
| AS17930JP | AS17930-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151035JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS2520JP | AS2520-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151032JP | TAO_SEATTLE - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151026JP | TAO_SAO_PAULO2 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4708JP | AS4708-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10026JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS3510JP | ERX-RWC-NET - Real World Computing Partnership | — | — | 0 |
| AS2521JP | AS2521-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59100JP | kochi-gc - Kochi Gakuen College | — | — | 0 |
| AS59113JP | RJV6-NET - RICOH JAPAN Corporation | — | — | 0 |
| AS58646JP | FBDC-B - FreeBit Co.,Ltd. | — | — | 0 |
| AS63778JP | BGPNAP2 - Border Gateway Protocol Network Analysis Project | — | 327.7K | 31 |
| AS4716JP | POWEREDCOM - KDDI CORPORATION | — | — | 0 |
| AS138986JP | WINDCLOUDNETWORK-MO - INAP Japan Tokyo Shiohama DC | — | 16 | 1 |
| AS131908JP | Intec-DCAN - INTEC Inc. | — | — | 0 |
| AS63788JP | MOCHIYA-NET - MOCHIYA Inc. | — | — | 0 |
| AS17702JP | AS17702-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23636JP | AS23636-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9996JP | KDDIIP-VPN - KDDI Corporation | — | — | 0 |
| AS138038JP | WOLFLAB-AS-AP - Wolf Network Lab | — | 1 | 1 |
| AS18067JP | HUMEIA - Humeia Corporation | — | — | 0 |
| AS24265JP | Agilit - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS18285JP | AS18285-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9992JP | AS9992-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4687JP | AS4687-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |