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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.
1,297 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 | 206 |
| 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 |
| AS10018JP | AS10018-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131084JP | MKInet-JP - MKI Network Solutions, Ltd. | — | — | 0 |
| AS58792JP | closip-1 - closip Inc. | — | — | 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 |
| AS9356JP | AS9356-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23789JP | AS23789-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4719JP | J-Stream-4 - J-Stream Inc. | — | — | 0 |
| AS4687JP | AS4687-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10026JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS151037JP | TAO_BEIJING - AT&T TAO Cloud Access Node | — | — | 0 |
| AS150355JP | BBIX-MAPSRS - BBIX,Inc. | — | — | 0 |
| AS23636JP | AS23636-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23821JP | AS23821-49 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7525JP | AS7525-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18067JP | HUMEIA - Humeia Corporation | — | — | 0 |
| AS151602JP | UTC-AS-AP - UD Trucks Corporation | — | — | 0 |
| AS37920JP | AS37920-33 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18098JP | AS18098-14 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | — | — | 0 |
| AS2524JP | RIM - EJWORKS CORPORATION | — | — | 0 |
| AS152467JP | ETS-AS-AP - ETS TELECOM ETS TELCO | — | — | 0 |
| AS151032JP | TAO_SEATTLE - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4701JP | AS4701-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17930JP | AS17930-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4692JP | INTERGATE - InternetWare Co., LTD. | — | — | 0 |
| AS146970JP | BBS - BBSakura Networks, Inc. | — | — | 0 |
| AS59100JP | kochi-gc - Kochi Gakuen College | — | — | 0 |
| AS59113JP | RJV6-NET - RICOH JAPAN Corporation | — | — | 0 |
| AS58646JP | FBDC-B - FreeBit Co.,Ltd. | — | — | 0 |
| AS37927JP | NOMURATRADE - Nomura Researth Institute, Ltd. | — | — | 0 |
| AS23806JP | HBS - Chupicom Inc. | — | — | 0 |
| AS45681JP | SHOW - Show Corporation | — | 512 | 2 |
| AS45676JP | AS45676-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7518JP | AS7518-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9592JP | PRISM - SOFTBANK TELECOM Corp. | — | — | 0 |
| AS10007JP | IPR - SoftBank Corp. | — | — | 0 |
| AS7661JP | AS7661-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS138181JP | HEXHU - Hu's Tech LLC | — | 3 | 2 |
| AS23779JP | N-BONE - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS37909JP | IKUEIKAN-NET - Ikueikan University | — | — | 0 |
| AS23748JP | CAT-AS-AP - Cat Networks K.K. | — | — | 0 |
| AS18285JP | AS18285-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4696JP | AS4696-14 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |