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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.
1,297 autonomous systems registered to Japan. Click an AS for detail.
| 669 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4M | 206 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| SAKURA-G - SAKURA Internet Inc. |
| — |
| — |
| 0 |
| AS2524JP | RIM - EJWORKS CORPORATION | — | — | 0 |
| AS4704JP | SANNET - Rakuten Mobile, Inc. | — | — | 0 |
| AS131962JP | AS131962-58 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS24266JP | AS24266-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23823JP | AS23823-51 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS4692JP | INTERGATE - InternetWare Co., LTD. | — | — | 0 |
| AS151037JP | TAO_BEIJING - AT&T TAO Cloud Access Node | — | — | 0 |
| AS139470JP | ONECHRONOS-AS-AP - OCX GROUP INC. | — | — | 0 |
| AS63787JP | AS63787-18 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7515JP | GIN-NTTLJ - NTT Ltd Japan Corporation | — | — | 0 |
| AS37913JP | AS37913-26 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS24293JP | AS24293-46 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18145JP | AS18145-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS23792JP | AS23792-20 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18067JP | HUMEIA - Humeia Corporation | — | — | 0 |
| AS4703JP | AS4703-21 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS2520JP | AS2520-24 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9356JP | AS9356-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10018JP | AS10018-29 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS37982JP | KIRINKK-AS-AP - Kirin K.K. | — | — | 0 |
| AS4696JP | AS4696-14 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS2521JP | AS2521-25 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131985JP | MAT-NET - Maple Audio Technology Corp | — | — | 0 |
| AS7507JP | AS7507-8 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS131908JP | Intec-DCAN - INTEC Inc. | — | — | 0 |
| AS63788JP | MOCHIYA-NET - MOCHIYA Inc. | — | — | 0 |
| AS150364JP | AS150364-10 - JPNIC-4Byte-ASBLOCK-AP | — | — | 0 |
| AS9599JP | INFOPEPPER - EJWORKS CORPORATION | — | — | 0 |
| AS17504JP | NETCOM - NRI Netcom, Ltd. | — | — | 0 |
| AS17702JP | AS17702-30 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS10007JP | IPR - SoftBank Corp. | — | — | 0 |
| AS7661JP | AS7661-2 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9592JP | PRISM - SOFTBANK TELECOM Corp. | — | — | 0 |
| AS17952JP | AS17952-23 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS17704JP | AS17704-32 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS7518JP | AS7518-19 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS18261JP | AS18261-3 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS38080JP | FSW-Tohoku-POP - Foresightwave INC. | — | — | 0 |
| AS10033JP | IVANET-TYO-AP - iBasis Tokyo ICO | — | — | 0 |
| AS7510JP | AS7510-11 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS9379JP | AS9379-31 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS152925JP | NARIYASUSANGYOKK-AS-AP - Nariyasu Sangyo Co., Ltd. | — | — | 0 |
| AS152728JP | NIPPONCOMMSINC-AS-AP - NIPPON COMMUNICATIONS INC. | — | — | 0 |
| AS131991JP | HELP-NET - JAPAN MAYDAY SERVICE CO., LTD. | — | — | 0 |
| AS4689JP | AS4689-7 - JPNIC-2Byte-ASBLOCK-AP | — | — | 0 |
| AS45846JP | FSW-Shiga-POP - Shiga area POP AS Number | — | — | 0 |