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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 | 205 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 36 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 67 |
| Sadaitec - Sadiatec Co., Ltd |
| — |
| — |
| 0 |
| AS131980JP | KINIKUNET - KADOKAWA CORPORATION | — | — | 0 |
| AS132592JP | STARCOLTD-AS-AP - Star Co,.Ltd. | — | — | 0 |
| AS151014JP | TAO_AMSTERDAM - AT&T TAO Cloud Access Node | — | — | 0 |
| AS17951JP | AS17951-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152150JP | MENLO-SEC-JP - Menlo Security Japan K.K. | — | — | 0 |
| AS18133JP | AS18133-13 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38610JP | APNIC-JP-RD - APNIC Research and Development | — | — | 0 |
| AS23832JP | AS23832-60 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS49671JP | DODO-NET DODO K.K. | — | — | 0 |
| AS149993JP | M4B42UG-AS-AP - 4b42 UG | — | — | 0 |
| AS137072JP | LEONCOLTD-AS-AP - LEON CO.LTD | — | — | 0 |
| AS4733JP | AS4733-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7519JP | AS7519-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7683JP | TRUNK-AS - trunk inc. | — | — | 0 |
| AS9596JP | AS9596-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151021JP | TAO_HONG_KONG4 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151038JP | TAO_MEXICO_CITY - AT&T TAO Cloud Access Node | — | — | 0 |
| AS2507JP | AS2507-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9222JP | INTEL-ONLINE-SERVICES-ASIA - Intel Online Services Asia | — | — | 0 |
| AS37896JP | AS37896-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63917JP | AMWAYJAPANGK-JP - 7-1, Udagawacho, | — | — | 0 |
| AS150143JP | IOTMEDIALAB-AS-AP - IotMedia Lab | — | — | 0 |
| AS151074JP | AS-VMW-TPE - VMWare Incorporation | — | — | 0 |
| AS2517JP | AS2517-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7619JP | IIJLAB-BACKUP-LINKS-EXP - Internet Initiative Japan, Inc. | — | — | 0 |
| AS2499JP | ipv4exh-lab - Japan Network Information Center | — | — | 0 |
| AS17527JP | MEDIAS - CHITA MEDIAS NETWORK INC. | — | — | 0 |
| AS146968JP | COMSQUARE - COMSQUARE Co.,Ltd. | — | — | 0 |
| AS55873JP | SJMAPNIC-JP - St. Jude Medical | — | — | 0 |
| AS131990JP | AS131990-86 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS150360JP | NTTE-WFL-AS - NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION | — | — | 0 |
| AS9602JP | AS9602-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151024JP | TAO_TOKYO - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4700JP | NIJI-NET - Niji-Net Inc. | — | — | 0 |
| AS151036JP | TAO_SHANGHAI - AT&T TAO Cloud Access Node | — | — | 0 |
| AS18288JP | AS18288-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23663JP | YAHOO-BANGALORE-AS-AP - Yahoo Bangalore Network Monitoring Center | — | — | 0 |
| AS23640JP | BBIX - BBIX,Inc. | — | — | 0 |
| AS24256JP | SOFTBANKBB - SOFTBANK Corp. | — | — | 0 |
| AS63808JP | AS63808-39 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4709JP | NETLAPUTA - NetLaputa Corporation | — | — | 0 |
| AS7508JP | AS7508-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23812JP | AS23812-40 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37924JP | KKR-MLIT-AS - Ministry of Land, Infrastructure and Transport Kinki Regional Development Bureau | — | — | 0 |
| AS147311JP | NGNJC-AS-AP - Nevigate Global Network Japan Corporation | — | — | 0 |
| AS37899JP | NTTW-NGN-AS - NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION | — | — | 0 |