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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
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 |
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| 0 |
| AS38647JP | GeekN-NetLab - NEI's NetLab | — | — | 0 |
| AS132726JP | SANYUNETCORP-JP - 5-3 Miyuki-cho | — | — | 0 |
| AS151030JP | TAO_LOS_ANGLELES1 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS7688JP | AS7688-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18073JP | AS18073-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24056JP | SINGTEL-EXPAN-JP - Internet Data Centre | — | — | 0 |
| AS38637JP | MAHOROBA-AS - Mahoroba Kobo, Inc. | — | — | 0 |
| AS26132JP | DDPS - DDPS Networks, LLC | — | — | 0 |
| AS59114JP | RECRUIT - Recruit Co., Ltd. | — | — | 0 |
| AS149993JP | M4B42UG-AS-AP - 4b42 UG | — | — | 0 |
| AS138038JP | WOLFLAB-AS-AP - Wolf Network Lab | — | — | 0 |
| AS7519JP | AS7519-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7531JP | GENOME - GenomeNet Project | — | — | 0 |
| AS9368JP | AS9368-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9998JP | ISAO - ISAO Corporation | — | — | 0 |
| AS151022JP | TAO_SYDNEY3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS151372JP | AS151372-2 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS146973JP | voip-enecom - Enecom,Inc. | — | — | 0 |
| AS9376JP | SAKURANET - SMARTVALUE Co.,Ltd. | — | — | 0 |
| AS37896JP | AS37896-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63917JP | AMWAYJAPANGK-JP - 7-1, Udagawacho, | — | — | 0 |
| AS9602JP | AS9602-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 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 |
| AS9594JP | AS9594-4 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17527JP | MEDIAS - CHITA MEDIAS NETWORK INC. | — | — | 0 |
| AS37895JP | RYUKOKU - Ryukoku University | — | — | 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 |
| AS150143JP | IOTMEDIALAB-AS-AP - IotMedia Lab | — | — | 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 |
| AS37911JP | AS37911-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 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 |
| AS23814JP | T-LEX - WIDE Project | — | — | 0 |
| AS37899JP | NTTW-NGN-AS - NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION | — | — | 0 |