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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 |
|---|---|---|---|---|
| AS55378JP | QUICK-YCCNET - QUICK Corp. | 1K | — | 1 |
| AS55894JP | WHOSNEXT - Who's Next | 1K | — | 1 |
| AS18149JP | JPRS - Japan Registry Service Co., Ltd. | 1K | 2 | 5 |
| AS37900JP | MATSURI - NTT DOCOMO BUSINESS, Inc. | 1K | 3 | 7 |
| AS131160JP | WI2 - Wire and Wireless Co.,Ltd. | 1K | 65.5K | 2 |
| AS131940JP | BETANET - Nissho Electronics Corp. | 1K | — | 3 |
| AS131945JP | SNTU-NET - Sanntuu Corporation | 1K | — | 1 |
| AS131946JP | MU-NET - MUSASHINO UNIVERSITY E.F. | 1K | — | 3 |
| AS63799JP | GHOST - Ghost Network | 1K | 65.5K | 4 |
| AS59110JP | BPS - BPS Inc. | 1K | 65.5K | 2 |
| AS151388JP | SE-JIKKEN-AS - SoftEther Corporation (SE-JIKKEN-AS) | 1K | 514 | 8 |
| AS58645JP | marinet - Miyagi Cable TV Co.,Ltd | 1K | 65.5K | 2 |
| AS146981JP | Nekojarashi - Nekojarashi Inc. | 1K | 65.5K | 6 |
| AS38648JP | F-REGI - F-REGI Co.,Ltd. | 1K | 65.5K | 2 |
| AS55382JP | HOT-CHA - Nagato city office | 1K | — | 1 |
| AS59097JP | OCH-NET - Okinawa Cross Head Co., Ltd. | 1K | — | 3 |
| AS4718JP | CKP - Cyber Kansai Project | 1K | 65.5K | 2 |
| AS401474JP | ENXO-NET-AS - ENXO LLC | 1K | — | 4 |
| AS131905JP | JPRS-GTLD - Japan Registry Services Co., Ltd. | 1K | 65.5K | 4 |
| AS55891JP | WBTSJP-AS - WATCH TOWER BIBLE AND TRACT SOCIETY | 1K | 133.6K | 13 |
| AS55907JP | GMO-DNS-R1 - GMO Internet, Inc. | 1K | 3 | 7 |
| AS138033JP | BBIX-AS-AP - BBIX, Inc | 1K | 65.5K | 5 |
| AS133476JP | FIRST-AS-AP - First Innovation K.K. | 1K | 65.5K | 2 |
| AS18289JP | TAO_TORONTO - AT&T TAO Cloud Access Node | 1K | — | 1 |
| AS131942JP | GURUNAVI-NET - Gurunavi, Inc. | 1K | — | 1 |
| AS133900JP | GSI-AP - Gilead Sciences, Inc. | 896 | — | 4 |
| AS199767JP | DOVE-AS Pinjia Zhao | 768 | 256 | 3 |
| AS38074JP | SDCC-AS-AP - SDCC Japan-West Area | 768 | 32.8K | 5 |
| AS63776JP | MERCARI-JP - Mercari, Inc. | 768 | 512 | 4 |
| AS146987JP | GMOCL-NET - GMO GlobalSign Holdings K.K. | 768 | — | 3 |
| AS131077JP | TOHMATSU-NET - Deloitte Tohmatsu Group LLC | 768 | — | 3 |
| AS37888JP | HORIBA-NET - HORIBA, Ltd. | 768 | — | 3 |
| AS45679JP | TOMOCHA-NET - Tatsumi, Tomo | 768 | 2 | 4 |
| AS24263JP | HONDA-NET - HONDA MOTOR Co., Ltd. | 768 | — | 3 |
| AS152645JP | FLEXTECHINC-AS-AP - Flextech Inc. | 768 | 65.5K | 4 |
| AS24283JP | MIEDEN-NET - Mieden Co.,Ltd. | 768 | — | 3 |
| AS150369JP | Infal - TelHi Corporation | 768 | 65.5K | 4 |
| AS151380JP | transformedu - Transform Co., Ltd. | 768 | — | 2 |
| AS59349JP | GMO-Z-COM - GMO-Z.COM PTE. LTD. | 768 | 1 | 3 |
| AS55911JP | kazukichi - kazukichi | 768 | 66.1K | 8 |
| AS24260JP | KINJO-AS - Board of trusty: Kinjo-Gakuen | 512 | — | 1 |
| AS137819JP | BEEKS-AS-AP - Beeks Financial Cloud (Japan) | 512 | — | 2 |
| AS138352JP | Fractal-NET - Fractal Co., Ltd. | 512 | — | 2 |
| AS133782JP | ELSEVIER-ASIAPACIFIC-AS-AP - Elsevier Ltd | 512 | — | 2 |
| AS150356JP | GMO-BRS - GMO BRAND SECURITY Inc. | 512 | — | 1 |
| AS152872JP | VL-NET - VirtualLink Networks | 512 | — | 2 |
| AS55396JP | FNCLAB - NRI SecureTechnologies, Ltd | 512 | — | 2 |
| AS58790JP | TeamFelNull - SERVER-G Group | 512 | 11 | 7 |
| AS146974JP | WP-NET - Woven by Toyota, Inc. | 512 | 65.5K | 2 |
| AS59120JP | TINS-NET - Tsukuba Internet Service Corporation | 512 | — | 1 |