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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.
| AS | Holder | IPv4 | Prefixes |
|---|---|---|---|
| AS17676JP | GIGAINFRA - SoftBank Corp. | 49.7M | 490 |
| AS4713JP | OCN - NTT DOCOMO BUSINESS,Inc. | 28.6M | 189 |
| AS2516JP | KDDI - KDDI CORPORATION | 18.2M | 578 |
| AS9824JP | JTCL-JP-AS - JCOM Co., Ltd. | 10.4M | 297 |
| AS2907JP | SINET-AS - Research Organization of Information and Systems, National Institute of Informatics | 9M | 668 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4.2M | 269 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
Share of announced address space covered by valid Route Origin Authorizations.
1,303 autonomous systems registered to Japan. Click an AS for detail.
| AS | Holder | IPv4 ↓ | IPv6 /48 | Prefixes |
|---|---|---|---|---|
| AS131983JP | SCNTV-NET - suo cablenet corporation | 512 | — | 1 |
| AS63806JP | MENHERA - Human-life Information Platforms Institute | 512 | 514 | 6 |
| AS139255JP | U-NEXT-AS-AP - U-NEXT Co.,Ltd. | 512 | — | 2 |
| AS152872JP | VL-NET - VirtualLink Networks | 512 | — | 2 |
| AS136761JP | KALYTERO - Kalytero LLC | 512 | — | 1 |
| AS151385JP | JAPANET-H - Japanet Holdings Co.,Ltd. | 512 | — | 1 |
| AS59120JP | TINS-NET - Tsukuba Internet Service Corporation | 512 | — | 1 |
| AS138352JP | Fractal-NET - Fractal Co., Ltd. | 512 | — | 2 |
| AS58790JP | TeamFelNull - SERVER-G Group | 512 | 11 | 7 |
| AS63791JP | DOORNOC-NET - doornoc | 512 | 65.5K | 2 |
| AS24260JP | KINJO-AS - Board of trusty: Kinjo-Gakuen | 512 | — | 1 |
| AS146985JP | KC-MSP-NET - KISSEI COMTEC Co.,Ltd | 512 | — | 1 |
| AS17941JP | BIT-ISLE - Equinix Japan Enterprise K.K. | 512 | — | 2 |
| AS55396JP | FNCLAB - NRI SecureTechnologies, Ltd | 512 | — | 2 |
| AS138321JP | Lunasla - Lunasla Inc. | 512 | 65.5K | 2 |
| AS141461JP | RA-NET - Reconciled Awareness Network | 512 | — | 1 |
| AS151371JP | PAINA - PAINA Information Development | 512 | 65.5K | 2 |
| AS151390JP | RUTILEA-A - RUTILEA, Inc. | 512 | — | 1 |
| AS7257JP | MARU-NET OTO GK | 512 | 524.3K | 3 |
| AS150366JP | Demae-can-NW - demae-can co. ltd | 512 | — | 2 |
| AS136779JP | SCHNEIDER-AS-JP - Schneider Electric Japan Ltd | 512 | — | 1 |
| AS152876JP | COMOTA - Comota Co., Ltd. | 512 | 65.5K | 2 |
| AS131988JP | TANET - Takehara Cable Network Co,Ltd | 512 | 65.5K | 2 |
| AS152877JP | NIN - Nintendo Co., Ltd | 512 | 2 | 4 |
| AS133782JP | ELSEVIER-ASIAPACIFIC-AS-AP - Elsevier Ltd | 512 | — | 2 |
| AS215871JP | XTOM-JP xTom Japan Corporation | 512 | 524.8K | 5 |
| AS63804JP | DOVA-YFM-NET - DOVA Corporation | 512 | — | 1 |
| AS38636JP | DENA-NET - DeNA, Co. Ltd. | 512 | 3 | 5 |
| AS945JP | JP-77-20220621 HAONAN YANG | 512 | — | 2 |
| AS152865JP | LC-NET - Tokyo University of Technology Linux Club | 512 | 4 | 2 |
| AS137819JP | BEEKS-AS-AP - Beeks Financial Cloud (Japan) | 512 | — | 2 |
| AS38656JP | Loutres - Loutres | 512 | 1 | 3 |
| AS146974JP | WP-NET - Woven by Toyota, Inc. | 512 | 65.5K | 2 |
| AS63790JP | CA-LAB - CyberAgent, Inc. | 512 | 65.5K | 2 |
| AS142052JP | MEMPOOLSPACEKK-AS-AP - Mempool Space K.K. | 512 | 2 | 4 |
| AS131902JP | LOGICLINKS2 - LogicLinks, Inc. | 512 | — | 2 |
| AS151383JP | EZSVS-NET - EZSVS Japan Co., Ltd. | 512 | — | 1 |
| AS152873JP | NEODY-NET - Neodyland | 512 | 65.5K | 4 |
| AS151350JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | 512 | — | 1 |
| AS63794JP | ILKS-NET - ILKS Inc. | 512 | 65.5K | 2 |
| AS4777JP | APNIC-COLO - Asia Pacific Network Information Centre | 512 | 16.4K | 4 |
| AS150368JP | TESTBED-KLN - SERVER-G Group | 256 | 3 | 4 |
| AS152184JP | TAMUKAINET-AS-AP - Tamukai Network | 256 | 264 | 10 |
| AS133180JP | STARBOWLTD-AS-AP - Starbow Ltd. | 256 | — | 1 |
| AS214675JP | Starlamp Hidenori Matsuo | 256 | 4.7K | 15 |
| AS23634JP | E-DNS-JP - WIDE Project | 256 | 8.2K | 2 |
| AS63795JP | ROUTEL - RoutelNet | 256 | 4.1K | 2 |
| AS131894JP | U-Cloud-2 - UNIADEX, LTD. | 256 | — | 1 |
| AS154090JP | FINSTADIUMX-AS-AP - FinStadiumX Co., Ltd. | 256 | — | 1 |
| AS131948JP | FORNEXT - FORNEXT Inc. | 256 | 1 | 2 |