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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 |
| AS131155JP | HANABI4 - NTT DOCOMO BUSINESS, Inc. | — | — | 0 |
| AS17673JP | MKInet - MITSUI KNOWLEDGE INDUSTRY CO., LTD. | — | — | 0 |
| AS7603JP | GENECOMPUTINGLTD-AS-AP - Gene Computing Ltd | — | — | 0 |
| AS4702JP | AS4702-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151075JP | AS-VMW-NRT - VMWare Incorporation | — | — | 0 |
| AS146978JP | BBIX-Fukuoka - BBIX, Inc. | — | — | 0 |
| AS17700JP | AS17700-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7681JP | AS7681-22 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS199436JP | A-NET BangLong Yang | — | 285 | 12 |
| AS45681JP | SHOW - Show Corporation | — | 512 | 2 |
| AS9602JP | AS9602-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9743JP | NIPPONEDUIX-AS-AP - Nippon EDUIX | — | 1 | 1 |
| AS138038JP | WOLFLAB-AS-AP - Wolf Network Lab | — | 1 | 1 |
| AS151072JP | AS-VMW-SIN - VMWare Incorporation | — | — | 0 |
| AS18287JP | AS18287-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151024JP | TAO_TOKYO - AT&T TAO Cloud Access Node | — | — | 0 |
| AS7669JP | AS7669-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63524JP | ASN-EQIX-CLOUD-OS - Equinix Asia Pacific | — | — | 0 |
| AS7523JP | TECHNOW - RICOH JAPAN Corporation | — | — | 0 |
| AS9375JP | AS9375-27 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS151074JP | AS-VMW-TPE - VMWare Incorporation | — | — | 0 |
| AS4722JP | SB4722 - SoftBank Corp. | — | — | 0 |
| AS18089JP | HIKARI-NWC - KDDI Corporation | — | — | 0 |
| AS38222JP | SDCCIX-EAST - Shimane-Japan Internet Exchange | — | — | 0 |
| AS131899JP | DIG-NET - DIG Inc. | — | — | 0 |
| AS23800JP | AS23800-28 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17697JP | BBX - NTT PC Communications, Inc. | — | — | 0 |
| AS9594JP | AS9594-4 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS154090JP | FINSTADIUMX-AS-AP - FinStadiumX Co., Ltd. | — | — | 0 |
| AS2499JP | ipv4exh-lab - Japan Network Information Center | — | — | 0 |
| AS9352JP | KUMAGAYA - KuMaGaYaNet | — | — | 0 |
| AS152863JP | OKIT-X - OKIT Corporation | — | — | 0 |
| AS131922JP | LN-NET - leafnet Co.,Ltd. | — | — | 0 |
| AS55906JP | AS55906-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17684JP | AS17684-12 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17945JP | iTV - iTV Co,Ltd | — | — | 0 |
| AS9380JP | CNCI-AS - Community Network Center Inc. | — | — | 0 |
| AS9359JP | AS9359-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS63778JP | BGPNAP2 - Border Gateway Protocol Network Analysis Project | — | 327.7K | 31 |
| AS24121JP | ASN-EQIX-OSAKA-AP - Equinix Asia Pacific | — | 512 | 2 |
| AS150314JP | RIVULETNETWORKS-AS-AP - Rivulet Networks | — | 1 | 1 |
| AS214772JP | NAZUKI-AS CHEN LUOAN | — | 16 | 1 |
| AS214430JP | xronos Takahiro Fukushima | — | 512 | 2 |
| AS151401JP | CYBERVISIONHOSTING-AS-AP - Cybervision Hosting Co Ltd | — | — | 0 |
| AS37911JP | AS37911-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23621JP | AS23621-10 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |