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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 |
| AS24273JP | CANON - CANON INC. | — | — | 0 |
| AS151019JP | TAO_SINGAPORE3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS9599JP | INFOPEPPER - EJWORKS CORPORATION | — | — | 0 |
| AS138328JP | SASMFL-AS-AP - Skadden, Arps, Slate, Meagher & Flom LLP | — | — | 0 |
| AS9992JP | AS9992-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18285JP | AS18285-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS3510JP | ERX-RWC-NET - Real World Computing Partnership | — | — | 0 |
| AS24292JP | AS24292-45 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7515JP | GIN-NTTLJ - NTT Ltd Japan Corporation | — | — | 0 |
| AS4712JP | JT-Net - JAPAN TOBACCO INC. | — | — | 0 |
| AS24256JP | SOFTBANKBB - SOFTBANK Corp. | — | — | 0 |
| AS17696JP | AS17696-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23806JP | HBS - Chupicom Inc. | — | — | 0 |
| AS4706JP | AS4706-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23815JP | JPIX-RS - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS4704JP | SANNET - Rakuten Mobile, Inc. | — | — | 0 |
| AS4689JP | AS4689-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS139470JP | ONECHRONOS-AS-AP - OCX GROUP INC. | — | — | 0 |
| AS9928JP | INIXP-ASIA-AS-AP - Rapid-Firey (INIXP Asia) | — | — | 0 |
| AS63796JP | AS63796-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151013JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS133795JP | CHOOPALLC-AS-AP - The Constant Company, LLC | — | — | 0 |
| AS135573JP | MBC-AS-AP - mediatti broadband communications | — | — | 0 |
| AS23823JP | AS23823-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131991JP | HELP-NET - JAPAN MAYDAY SERVICE CO., LTD. | — | — | 0 |
| AS17942JP | AS17942-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59101JP | AS59101-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24297JP | FCN - University Public Corporation Osaka | — | — | 0 |
| AS18095JP | REITAKU - Reitaku University | — | — | 0 |
| AS24285JP | AS24285-38 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17704JP | AS17704-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18193JP | TELSTRAGLOBAL - Telstra Global Internet Services Network Blocks | — | — | 0 |
| AS17935JP | AS17935-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18270JP | TOIN - Toin University of Yokohama | — | — | 0 |
| AS7661JP | AS7661-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7675JP | AS7675-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9610JP | AS9610-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151020JP | TAO_HONG_KONG2 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS7528JP | AS7528-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38645JP | NTTCOM-GRX - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS150143JP | IOTMEDIALAB-AS-AP - IotMedia Lab | — | — | 0 |
| AS9620JP | AS9620-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7518JP | AS7518-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS55389JP | JPNE - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS4708JP | AS4708-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4703JP | AS4703-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |