Japan
Autonomous systems and IP prefixes registered in Japan.
Registered ASNs
285
IPv4 Prefixes
18,640
IPv6 Prefixes
2,408
Largest Networksby registered prefixes
| # | ASN | Name | Prefixes |
|---|---|---|---|
| 1 | AS215239 | RIPENCCSHOW Show Corporation | 250 |
| 2 | AS2907 | APNICSINET-AS Research Organization of Information and Systems, National Institute of Informatics | 122 |
| 3 | AS3258 | RIPENCCXTOM-JAPAN xTom Japan Corporation | 111 |
| 4 | AS2497 | APNICIIJ Internet Initiative Japan Inc. | 76 |
| 5 | AS142622 | APNICDIL-AS-AP Dream Information Laboratory | 44 |
| 6 | AS4785 | APNICXTOM-AS-JP xTom | 43 |
| 7 | AS9824 | APNICJTCL-JP-AS JCOM Co., Ltd. | 38 |
| 8 | AS132827 | APNICGATEWAY-AS-AP GATEWAY INC | 36 |
| 9 | AS134351 | APNICLEASEWEB-AS-AP Leaseweb Japan K.K. | 29 |
| 10 | AS214675 | RIPENCCStarlamp Hidenori Matsuo | 21 |
| 11 | AS135161 | APNICGMO-Z-COM-TH GMO-Z com NetDesign Holdings Co., Ltd. | 20 |
| 12 | AS138384 | APNICRMNI-AS-AP Rakuten Mobile Network, Inc. | 20 |
| 13 | AS139468 | APNICDCI-AS-AP DC Communications Inc. | 14 |
| 14 | AS213471 | RIPENCCIPPNOC YAMAMOTO Hiroshi | 14 |
| 15 | AS23661 | APNICCLARA-AS-AP CLARA, Inc. | 12 |
| 16 | AS24477 | APNICNETAPPAS NetApp, Inc. | 12 |
| 17 | AS24229 | APNICKOCHI-IX IX-layers, Inc. | 11 |
| 18 | AS45436 | APNICWORKUP-AS-AP WorkUP Inc. | 11 |
| 19 | AS138968 | APNICRAINBOWIDC-AS-AP rainbow network limited | 11 |
| 20 | AS149428 | APNICCODE200-AS-AP Code200, UAB | 11 |
| 21 | AS9466 | APNICUUNET-JP-AP UUNET Japan Limited | 10 |
| 22 | AS63997 | APNICTSUKAERUNET Tsukaeru.net, Web Hosting Company, Japan | 10 |
| 23 | AS17661 | APNICNHN-JAPAN NHN Cloud Japan Corporation | 9 |
| 24 | AS18526 | ARINDDPS - DDPS Networks, LLC | 9 |
| 25 | AS17707 | APNICDATAHOTEL-JP AS for DATAHOTEL, which is one of iDC in Japan | 8 |
| 26 | AS24572 | APNICYAHOO-JP-AS-AP Yahoo Japan | 8 |
| 27 | AS55569 | APNICCRITEO-AS-AP Criteo APAC | 8 |
| 28 | AS56024 | APNICKARSCOLTD-AS-AP KARSCOLTD- | 8 |
| 29 | AS137445 | APNICAS-PFLINK-JP PF LINK SYSTEMS | 8 |
| 30 | AS139076 | APNICENJOYVC-AS-AP EnjoyVC Japan Corporation | 8 |
| 31 | AS141757 | APNICZJC-AS-AP Zoho Japan Corporation | 8 |
| 32 | AS152324 | APNICM3XNETCOLTD-AS-AP 3XNET Co., Ltd. | 8 |
| 33 | AS38462 | APNICOCE-AS-AP Osaki Computer Engineering Co.Ltd | 7 |
| 34 | AS38895 | APNICAMAZON-AS-AP Amazon.com Tech Telecom | 7 |
| 35 | AS51044 | RIPENCCRHE Kazuki Yamaguchi | 7 |
| 36 | AS133795 | APNICCHOOPALLC-AS-AP The Constant Company, LLC | 6 |
| 37 | AS139345 | APNICHYVEMANAGEDHOSTINGCORPINC-AS-AP Hyve Managed Hosting Corp Inc | 6 |
| 38 | AS54415 | APNICWIZ-JP-AS-AP WIZ K.K. | 5 |
| 39 | AS133445 | APNICFIVE9INC-AS-AP Five9, Inc. | 5 |
| 40 | AS136796 | APNICCL-JP-AS CORELINK JAPAN | 5 |
| 41 | AS142052 | APNICMEMPOOLSPACEKK-AS-AP Mempool Space K.K. | 5 |
| 42 | AS199436 | RIPENCCA-NET BangLong Yang | 5 |
| 43 | AS214968 | RIPENCCKNEE-NET-AS JIANG Zhirui | 5 |
| 44 | AS23720 | APNICRMNI-AS-AP Rakuten Mobile Network, Inc. | 4 |
| 45 | AS38074 | APNICSDCC-AS-AP SDCC Japan-West Area | 4 |
| 46 | AS59349 | APNICGMO-Z-COM GMO-Z.COM PTE. LTD. | 4 |
| 47 | AS63000 | ARINUS-CORE - Auk LLC | 4 |
| 48 | AS131904 | APNICCYBERFEELINC-JP Cyber Feel Inc. | 4 |
| 49 | AS133900 | APNICGSI-AP Gilead Sciences, Inc. | 4 |
| 50 | AS152645 | APNICFLEXTECHINC-AS-AP Flextech Inc. | 4 |
| 51 | AS214430 | RIPENCCxronos Takahiro Fukushima | 4 |
| 52 | AS401655 | ARINTRANSVISIONNET - TransVision LLC | 4 |
| 53 | AS4777 | APNICAPNIC-COLO Asia Pacific Network Information Centre | 3 |
| 54 | AS7257 | RIPENCCMARU-NET OTO GK | 3 |
| 55 | AS17977 | APNICSINGTEL-JP NF Park Bldg.3F, 9-15, Futaba 2-Chome | 3 |
| 56 | AS18121 | APNICINCL Ishikawa Computer Center Co.,LTD. | 3 |
| 57 | AS24512 | APNICHAL-INTERNET HAL Internet, Internet Service Provider, Tottori, Japan | 3 |
| 58 | AS32340 | ARINZEN-BACKBONE - ZenWalk | 3 |
| 59 | AS38215 | APNICSYUHEIUDA-AS-AP Syuhei Uda | 3 |
| 60 | AS46953 | ARININCLEAF - FENGYE INC | 3 |
| 61 | AS49671 | RIPENCCDODO-NET DODO K.K. | 3 |
| 62 | AS56291 | APNICACE-AS-AP Ace, Inc. | 3 |
| 63 | AS63770 | APNICICSCOE-AS Industrial Cyber Security Center of Excellence | 3 |
| 64 | AS131905 | APNICJPRS-GTLD Japan Registry Services Co., Ltd. | 3 |
| 65 | AS133458 | APNICFSCJCL-AS-AP FPT Smart Cloud Japan Co., Ltd | 3 |
| 66 | AS137819 | APNICBEEKS-AS-AP Beeks Financial Cloud Japan | 3 |
| 67 | AS138652 | APNICSGCOM-AS-AP Super Godzilla Communications GK | 3 |
| 68 | AS139358 | APNICKANSUIUN-AS-AP Kansuiun Co., Ltd | 3 |
| 69 | AS142165 | APNICBOSCHCORPORATION-AS-AP Bosch Corporation | 3 |
| 70 | AS151195 | APNICNGIKK-AS-AP Nova Global ICT Kabushiki Kaisha | 3 |
| 71 | AS154936 | APNICTAIPEI101-AS-AP TAIPEI101 NETWORK LLC | 3 |
| 72 | AS201345 | RIPENCCShuma-Watanabe Shuma Watanabe | 3 |
| 73 | AS945 | RIPENCCJP-77-20220621 HAONAN YANG | 2 |
| 74 | AS2915 | APNICBBIX-OCX BBIX, Inc. | 2 |
| 75 | AS7500 | APNICM-ROOT-DNS WIDE Project | 2 |
| 76 | AS7660 | APNICAPAN-JP Asia Pacific Advanced Network - Japan | 2 |
| 77 | AS18259 | APNICHIGE NTT DOCOMO BUSINESS, Inc | 2 |
| 78 | AS18383 | APNICCAHI-AS-JP CAHI Corporation | 2 |
| 79 | AS23297 | ARINTUEAN - Tuean LLC | 2 |
| 80 | AS24567 | APNICQTINC-AS-AP QT Inc. | 2 |
| 81 | AS37982 | APNICKIRINKK-AS-AP Kirin K.K. | 2 |
| 82 | AS54132 | ARINFINDER - Finder Networks LLC | 2 |
| 83 | AS55873 | APNICSJMAPNIC-JP St. Jude Medical | 2 |
| 84 | AS56023 | APNICSMARTNET-AS-AP SmartRams Co., Ltd. | 2 |
| 85 | AS56033 | APNICRAKUIP-AS-AP Rakushasu Inc | 2 |
| 86 | AS56218 | APNICQGPOP-AS-AP QGPOP | 2 |
| 87 | AS58535 | APNICCOLT-AS-AP Colt Technology Services B.V. | 2 |
| 88 | AS58645 | APNICMARINET Miyagi Cable TV Co.,Ltd | 2 |
| 89 | AS62184 | RIPENCCMNO-AS Michal Nowak | 2 |
| 90 | AS132119 | APNICTECPRESSO-NET-AP TECPRESSO Inc. | 2 |
| 91 | AS132504 | APNICQUALITIA-AS-AP QUALITIA Co.,Ltd | 2 |
| 92 | AS132592 | APNICSTARCOLTD-AS-AP Star Co,.Ltd. | 2 |
| 93 | AS132610 | APNICOTA-NET Ota Network | 2 |
| 94 | AS133180 | APNICSTARBOWLTD-AS-AP Starbow Ltd. | 2 |
| 95 | AS133405 | APNICRETNKK-AS-AP RETN Co., Ltd. | 2 |
| 96 | AS133476 | APNICFIRST-AS-AP First Innovation K.K. | 2 |
| 97 | AS133780 | APNICQMC-AS-AP Quantum Mesh Co.,Ltd. | 2 |
| 98 | AS136506 | APNICLEONCOLTD-AS-AP LEON CO.LTD | 2 |
| 99 | AS138033 | APNICBBIX-AS-AP BBIX, Inc | 2 |
| 100 | AS138321 | APNICLUNASLA Lunasla Inc. | 2 |
Threat map: malicious IPs in Japan
264 flagged IPv4 networks on 2026-10-11, #16 of 179 countries; 1.40 per million allocated IPv4 addresses (#76 by rate).
IP Address Transfers
Last 12 months: 97 registry transfers involving organisations in Japan, 1.8M IPv4 addresses.
IPv4 received from
- 1🇺🇸 United States82K
- 2🇪🇸 Spain66K
- 3🇬🇧 United Kingdom8,192
- 4🇲🇳 Mongolia2,048
IPv4 sent to
- 1🇵🇭 Philippines8,192
- 2🇲🇲 Myanmar (Burma)2,048
- 3🇹🇭 Thailand2,048
- 4🇦🇺 Australia1,024
- 5🇭🇰 Hong Kong SAR China1,024
- 157.250.176.0/20Transfer ·
- AS5111inter-RIRTransfer ·
- 220.39.48.0/20Transfer ·
- 103.30.240.0/22Transfer ·
- 220.145.128.0/18Transfer ·
- AS7469inter-RIRTransfer ·
- 203.173.80.0/21Transfer ·
- 80.47.64.0/19inter-RIRTransfer ·
- 153.79.80.0/20inter-RIRTransfer ·
- 157.8.240.0/22Transfer ·
| Date | Resource | From | To | Type |
|---|---|---|---|---|
| 157.250.176.0/20 | Transfer | |||
| AS5111inter-RIR | Transfer | |||
| 220.39.48.0/20 | Transfer | |||
| 103.30.240.0/22 | Transfer | |||
| 220.145.128.0/18 | Transfer | |||
| AS7469inter-RIR | Transfer | |||
| 203.173.80.0/21 | Transfer | |||
| 80.47.64.0/19inter-RIR | Transfer | |||
| 153.79.80.0/20inter-RIR | Transfer | |||
| 157.8.240.0/22 | Transfer |