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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 |
| AS4731JP | AS4731-49 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4735JP | AS4735-53 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151033JP | TAO_MUMBAI2 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS63807JP | AS63807-38 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37927JP | NOMURATRADE - Nomura Researth Institute, Ltd. | — | — | 0 |
| AS3391JP | ERX-ASCII-NET - ASCIInet Corporation | — | — | 0 |
| AS56291JP | ACE-AS-AP - Ace, Inc. | — | — | 0 |
| AS63796JP | AS63796-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS59101JP | AS59101-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS133229JP | SKIPLLC-AS-AP - SKIP LLC | — | — | 0 |
| AS131154JP | SHOWNET-4AS - NANO OPT Media, Inc. | — | — | 0 |
| AS146970JP | BBS - BBSakura Networks, Inc. | — | — | 0 |
| AS24273JP | CANON - CANON INC. | — | — | 0 |
| AS23823JP | AS23823-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4716JP | POWEREDCOM - KDDI CORPORATION | — | — | 0 |
| AS7528JP | AS7528-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4714JP | AS4714-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24285JP | AS24285-38 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7680JP | AS7680-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4703JP | AS4703-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63803JP | AS63803-34 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7689JP | AS7689-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS147295JP | METROENGINESINC-AS-AP - Metro Engines Inc | — | — | 0 |
| AS150355JP | BBIX-MAPSRS - BBIX,Inc. | — | — | 0 |
| AS18133JP | AS18133-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151035JP | TAO_LONDON - AT&T TAO Cloud Access Node | — | — | 0 |
| AS17951JP | AS17951-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152925JP | NARIYASUSANGYOKK-AS-AP - Nariyasu Sangyo Co., Ltd. | — | — | 0 |
| AS131935JP | KAMOIKE-ORG - Kamoike.net LLP | — | — | 0 |
| AS17692JP | KCCS - Kyocera Communication Systems Co., Ltd. | — | — | 0 |
| AS152150JP | MENLO-SEC-JP - Menlo Security Japan K.K. | — | — | 0 |
| AS17507JP | AS17507-5 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9996JP | KDDIIP-VPN - KDDI Corporation | — | — | 0 |
| AS10007JP | IPR - SoftBank Corp. | — | — | 0 |
| AS132120JP | ISC-AP - Internet Systems Consortium | — | — | 0 |
| AS10017JP | AS10017-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS26132JP | DDPS - DDPS Networks, LLC | — | — | 0 |
| AS9363JP | FNETS - FUJITSU NETWORK SOLUTIONS LIMITED | — | — | 0 |
| AS151031JP | TAO_AUCKLAND - AT&T TAO Cloud Access Node | — | — | 0 |
| AS132024JP | REBYC-JP - Rebyc Inc. | — | — | 0 |
| AS17704JP | AS17704-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17952JP | AS17952-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9368JP | AS9368-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18079JP | AS18079-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17525JP | AS17525-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23638JP | AMIXCOM - AMIXCOM Inc. | — | — | 0 |