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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.
1,303 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. | 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 |
| 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 |