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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 |
| 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 |