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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 |
| AS23812JP | AS23812-40 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151013JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS7673JP | ALLES - ejworks corporation | — | — | 0 |
| AS17952JP | AS17952-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63917JP | AMWAYJAPANGK-JP - 7-1, Udagawacho, | — | — | 0 |
| AS131106JP | DATAHOTEL-JP - AS for DATAHOTEL, which is one of iDC in Japan, | — | — | 0 |
| AS151075JP | AS-VMW-NRT - VMWare Incorporation | — | — | 0 |
| AS133795JP | CHOOPALLC-AS-AP - The Constant Company, LLC | — | — | 0 |
| AS140642JP | WASABI-AS-AP - Wasabi Technologies Inc. | — | — | 0 |
| AS131908JP | Intec-DCAN - INTEC Inc. | — | — | 0 |
| AS37923JP | FIC - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | — | — | 0 |
| AS150355JP | BBIX-MAPSRS - BBIX,Inc. | — | — | 0 |
| AS9349JP | AS9349-1 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4712JP | JT-Net - JAPAN TOBACCO INC. | — | — | 0 |
| AS45676JP | AS45676-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17684JP | AS17684-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4691JP | DTI - Dream Train Internet Inc. | — | — | 0 |
| AS151036JP | TAO_SHANGHAI - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4692JP | INTERGATE - InternetWare Co., LTD. | — | — | 0 |
| AS63792JP | HYPERSPACE - Hyperspace Communications | — | — | 0 |
| AS45846JP | FSW-Shiga-POP - Shiga area POP AS Number | — | — | 0 |
| AS23787JP | AS23787-15 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9610JP | AS9610-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17527JP | MEDIAS - CHITA MEDIAS NETWORK INC. | — | — | 0 |
| AS24293JP | AS24293-46 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9373JP | AS9373-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7518JP | AS7518-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7523JP | TECHNOW - RICOH JAPAN Corporation | — | — | 0 |
| AS4704JP | SANNET - Rakuten Mobile, Inc. | — | — | 0 |
| AS2499JP | ipv4exh-lab - Japan Network Information Center | — | — | 0 |
| AS17526JP | AS17526-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17520JP | AS17520-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152467JP | ETS-AS-AP - ETS TELECOM ETS TELCO | — | — | 0 |
| AS146968JP | COMSQUARE - COMSQUARE Co.,Ltd. | — | — | 0 |
| AS2502JP | TRAIN - The University of Tokyo | — | — | 0 |
| AS23819JP | AS23819-47 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS46953JP | INCLEAF - FENGYE INC | — | — | 0 |
| AS151381JP | AS151381-11 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS151015JP | TAO_FRANKFURT - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151021JP | TAO_HONG_KONG4 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS9379JP | AS9379-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS136407JP | VIRTUSTREAMJP-AS-AP - Virtustream Cloud Services Australia Pty Limited | — | — | 0 |
| AS55817JP | NTTECL-AS-AP - Nippon Telegraph and Telephone Corporation PF Labs | — | — | 0 |
| AS59101JP | AS59101-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152728JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | — | — | 0 |