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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.
| 668 |
| 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 |
| AS24285JP | AS24285-38 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151029JP | TAO_MIAMI1 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS9356JP | AS9356-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS142584JP | IMAGINGBAYINC-AS-AP - Imaging Bay, Inc. | — | — | 0 |
| AS9599JP | INFOPEPPER - EJWORKS CORPORATION | — | — | 0 |
| AS9992JP | AS9992-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4705JP | AS4705-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS55892JP | NTTE-RIW - Nippon Telegraph and Telephone East Corporation | — | — | 0 |
| AS7507JP | AS7507-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4712JP | JT-Net - JAPAN TOBACCO INC. | — | — | 0 |
| AS23640JP | BBIX - BBIX,Inc. | — | — | 0 |
| AS17696JP | AS17696-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | — | — | 0 |
| AS7504JP | AS7504-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23815JP | JPIX-RS - Japan Internet Xing Co., Ltd. | — | — | 0 |
| AS4706JP | AS4706-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4704JP | SANNET - Rakuten Mobile, Inc. | — | — | 0 |
| AS150364JP | AS150364-10 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS9928JP | INIXP-ASIA-AS-AP - Rapid-Firey (INIXP Asia) | — | — | 0 |
| AS63796JP | AS63796-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151034JP | TAO_MUMBAI3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS139470JP | ONECHRONOS-AS-AP - OCX GROUP INC. | — | — | 0 |
| AS133445JP | FIVE9INC-AS-AP - Five9, Inc. | — | — | 0 |
| AS24293JP | AS24293-46 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131991JP | HELP-NET - JAPAN MAYDAY SERVICE CO., LTD. | — | — | 0 |
| AS17959JP | AS17959-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS55817JP | NTTECL-AS-AP - Nippon Telegraph and Telephone Corporation PF Labs | — | — | 0 |
| AS23835JP | AS23835-63 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18082JP | LASDEC - Japan Agency for Local Authority Information Systems | — | — | 0 |
| AS24294JP | AS24294-47 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17528JP | AS17528-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18083JP | AS18083-17 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7685JP | AS7685-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17702JP | AS17702-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9610JP | AS9610-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4710JP | NTTV6NET2 - Nippon Telegraph and Telephone Corporation | — | — | 0 |
| AS18095JP | REITAKU - Reitaku University | — | — | 0 |
| AS1233JP | ERX-NASDA-ASN - National Space Development Agency | — | — | 0 |
| AS7518JP | AS7518-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37921JP | AS37921-34 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63808JP | AS63808-39 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9612JP | AS9612-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4716JP | POWEREDCOM - KDDI CORPORATION | — | — | 0 |
| AS38640JP | SAKURA-E - SAKURA Internet Inc. | — | — | 0 |
| AS4708JP | AS4708-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4703JP | AS4703-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |