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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.
| 667 |
| 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 |
| AS4705JP | AS4705-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131985JP | MAT-NET - Maple Audio Technology Corp | — | — | 0 |
| AS59100JP | kochi-gc - Kochi Gakuen College | — | — | 0 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | — | — | 0 |
| AS136796JP | CL-JP-AS - CORELINK JAPAN | — | — | 0 |
| AS24274JP | AS24274-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17702JP | AS17702-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 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 |
| AS10018JP | AS10018-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151384JP | BBIX-CACHE - BBIX, Inc. | — | — | 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 |
| AS17674JP | AS17674-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4703JP | AS4703-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37909JP | IKUEIKAN-NET - Ikueikan University | — | — | 0 |
| AS18067JP | HUMEIA - Humeia Corporation | — | — | 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 |
| AS17526JP | AS17526-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4692JP | INTERGATE - InternetWare Co., LTD. | — | — | 0 |
| AS3510JP | ERX-RWC-NET - Real World Computing Partnership | — | — | 0 |
| AS59112JP | PLUSONE - Plus One marketing Ltd. | — | — | 0 |
| AS131084JP | MKInet-JP - MKI Network Solutions, Ltd. | — | — | 0 |
| AS58792JP | closip-1 - closip Inc. | — | — | 0 |
| AS138181JP | HEXHU - Hu's Tech LLC | — | 3 | 2 |
| AS4716JP | POWEREDCOM - KDDI CORPORATION | — | — | 0 |
| AS138038JP | WOLFLAB-AS-AP - Wolf Network Lab | — | 1 | 1 |
| AS131908JP | Intec-DCAN - INTEC Inc. | — | — | 0 |
| AS63788JP | MOCHIYA-NET - MOCHIYA Inc. | — | — | 0 |
| AS18270JP | TOIN - Toin University of Yokohama | — | — | 0 |
| AS23806JP | HBS - Chupicom Inc. | — | — | 0 |
| AS10007JP | IPR - SoftBank Corp. | — | — | 0 |
| AS63778JP | BGPNAP2 - Border Gateway Protocol Network Analysis Project | — | 327.7K | 31 |
| AS18080JP | SOPIA - Sopiafons Co.,Ltd | — | — | 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 |