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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 |
| AS23814JP | T-LEX - WIDE Project | — | — | 0 |
| AS55889JP | BITISLE-WEST - Equinix Japan Enterprise K.K. | — | — | 0 |
| AS131935JP | KAMOIKE-ORG - Kamoike.net LLP | — | — | 0 |
| AS131153JP | KVH-ISP - KVH Co., Ltd. | — | — | 0 |
| AS38627JP | BAIDUJP - Baidu, Inc. | — | — | 0 |
| AS131078JP | KDDLAB-4OCT - KDDI Research, Inc. | — | — | 0 |
| AS131974JP | TOCHIGIX - Cable TV Corporation | — | — | 0 |
| AS7680JP | AS7680-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9377JP | AS9377-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17525JP | AS17525-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7673JP | ALLES - ejworks corporation | — | — | 0 |
| AS24056JP | SINGTEL-EXPAN-JP - Internet Data Centre | — | — | 0 |
| AS23617JP | AS23617-6 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS26132JP | DDPS - DDPS Networks, LLC | — | — | 0 |
| AS131927JP | TVM - TV Matsumoto Cablevision | — | — | 0 |
| AS137072JP | LEONCOLTD-AS-AP - LEON CO.LTD | — | — | 0 |
| AS152150JP | MENLO-SEC-JP - Menlo Security Japan K.K. | — | — | 0 |
| AS4733JP | AS4733-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9364JP | AS9364-16 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9409JP | RAPIDFIREYJP-AS-AP - Rapid-Fire-y (Tokyo) | — | — | 0 |
| AS138632JP | ENMOE-AS-AP - Enmoe Network | — | — | 0 |
| AS151022JP | TAO_SYDNEY3 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS38222JP | SDCCIX-EAST - Shimane-Japan Internet Exchange | — | — | 0 |
| AS18089JP | HIKARI-NWC - KDDI Corporation | — | — | 0 |
| AS55906JP | AS55906-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131922JP | LN-NET - leafnet Co.,Ltd. | — | — | 0 |
| AS152863JP | OKIT-X - OKIT Corporation | — | — | 0 |
| AS9352JP | KUMAGAYA - KuMaGaYaNet | — | — | 0 |
| AS2499JP | ipv4exh-lab - Japan Network Information Center | — | — | 0 |
| AS154090JP | FINSTADIUMX-AS-AP - FinStadiumX Co., Ltd. | — | — | 0 |
| AS9594JP | AS9594-4 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17697JP | BBX - NTT PC Communications, Inc. | — | — | 0 |
| AS23800JP | AS23800-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131899JP | DIG-NET - DIG Inc. | — | — | 0 |
| AS151075JP | AS-VMW-NRT - VMWare Incorporation | — | — | 0 |
| AS151023JP | TAO_SYDNEY5 - AT&T TAO Cloud Access Node | — | — | 0 |
| AS4700JP | NIJI-NET - Niji-Net Inc. | — | — | 0 |
| AS151073JP | AS-VMW-SYD - VMWare Incorporation | — | — | 0 |
| AS2503JP | AS2503-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10124JP | AMAZON-AP-RESOURCES-AS-AP-NRT - Amazon Data Services Japan KK | — | — | 0 |
| AS17681JP | AS17681-9 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23640JP | BBIX - BBIX,Inc. | — | — | 0 |
| AS37921JP | AS37921-34 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38645JP | NTTCOM-GRX - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS4251JP | ERX-TWICS - TWICS Co. Ltd. | — | — | 0 |
| AS4709JP | NETLAPUTA - NetLaputa Corporation | — | — | 0 |