38 operators · 150 facilities · 3,100 MW tracked
Data center companies in Japan
38 operators run 150 tracked data centers in Japan: 126 operational, 24 under construction or announced, 3,100+ MW of published IT capacity. Built from operator and registry sources — a shortlist of the market, not an exhaustive census.
How many data center companies operate in Japan?
Coloprice tracks 38 data center operators with 150 facilities in Japan. The largest by facility count is Equinix (17 facilities); by published IT capacity it is Ada Infrastructure with 601 MW disclosed. Counts reflect the Coloprice catalog as of 2026-10-01.
Largest by tracked facilities
- Equinix 17 facilities
- Internet Initiative Japan (IIJ) 12 facilities
- MC Digital Realty 10 facilities
- NTT Communications (NTT DOCOMO BUSINESS) — Nexcenter 10 facilities
- Colt DCS 8 facilities
Largest by published capacity
- Ada Infrastructure 601 MW published
- AirTrunk 370 MW published
- NTT Global Data Centers 337 MW published
- SoftBank Corp. / IDC Frontier 300 MW published
- DayOne 242 MW published
Operators in Japan
Sorted by tracked facilities, then published capacity. MW is the sum of capacity each operator publishes for its Japan sites — undisclosed values are not estimated.
| Operator | Facilities | Published MW | Cities | Status | Certifications | AI-ready |
|---|---|---|---|---|---|---|
| Equinix | 17 | 54 MW (1 of 17 sites) | Tokyo (Inzai), Osaka (Ibaraki) | 17 live · 0 pipeline | ISO 22301, ISO 27001, ISO 9001 | — |
| Internet Initiative Japan (IIJ) | 12 | 20 MW (1 of 12 sites) | Tokyo (Inzai), Matsue, Shimane, Yokohama, Kanagawa, Osaka (Ibaraki) +1 | 12 live · 0 pipeline | ISO 14001, ISO 27001, FISC | — |
| MC Digital Realty | 10 | 217 | Tokyo (Inzai), Osaka (Ibaraki) | 9 live · 1 pipeline | not published | 3 |
| NTT Communications (NTT DOCOMO BUSINESS) — Nexcenter | 10 | not published | Tokyo (Inzai), Yokohama, Kanagawa, Osaka (Ibaraki), Takamatsu, Kagawa | 10 live · 0 pipeline | FISC facility-standard compliance, JDCC Tier 4, NVIDIA DGX-Ready Data Center Program | 1 |
| Colt DCS | 8 | 233 | Tokyo (Inzai), Seika (Kyoto Prefecture), Yoshikawa (Saitama) | 6 live · 2 pipeline | not published | 1 |
| AT TOKYO | 8 | 40 MW (1 of 8 sites) | Tokyo (Inzai), Osaka (Ibaraki), Kasuya, Fukuoka | 8 live · 0 pipeline | not published | — |
| Digital Edge | 7 | 45 MW (5 of 7 sites) | Tokyo (Inzai), Osaka (Ibaraki), Yokohama, Kanagawa | 6 live · 1 pipeline | ISO 14001, ISO 27001, ISO 45001 | — |
| NTT DATA | 7 | not published | Tokyo (Inzai), Osaka (Ibaraki), Kasuya, Fukuoka | 7 live · 0 pipeline | not published | — |
| Ada Infrastructure | 5 | 601 | Tokyo (Inzai), Osaka (Ibaraki) | 1 live · 4 pipeline | Uptime Institute Tier III Certification of Design Documents (TKW1-1) | 1 |
| NTT Global Data Centers | 5 | 337 | Osaka (Ibaraki), Tokyo (Inzai), Seika (Kyoto Prefecture) | 2 live · 3 pipeline | not published | 2 |
| Telehouse | 5 | 25 MW (2 of 5 sites) | Tokyo (Inzai), Osaka (Ibaraki) | 4 live · 1 pipeline | ISO 27001, JDCC Tier 4 | 1 |
| Sakura Internet | 5 | not published | Tokyo (Inzai), Osaka (Ibaraki), Ishikari (Hokkaido) | 5 live · 0 pipeline | not published | — |
| IDC Frontier | 4 | 50 MW (1 of 4 sites) | Tokyo (Inzai), Osaka (Ibaraki) | 4 live · 0 pipeline | ISO 27001 | — |
| NTT SmartConnect | 4 | not published | Osaka-Shi Kita-Ku, Hakata, Osaka (Ibaraki) | 4 live · 0 pipeline | not published | — |
| Optage | 4 | not published | Osaka (Ibaraki) | 4 live · 0 pipeline | not published | — |
| AirTrunk | 3 | 370 | Tokyo (Inzai), Osaka (Ibaraki) | 3 live · 0 pipeline | not published | 1 |
| CTC (ITOCHU Techno-Solutions) | 3 | not published | Kobe (Kita-ku), Yokohama, Kanagawa, Tokyo (Inzai) | 3 live · 0 pipeline | FISC, ISO14001, ISO27001 | — |
| Digital Realty | 3 | not published | Ibaraki-city, Minoo-shi, Inzai-City | 3 live · 0 pipeline | not published | — |
| NEC | 3 | not published | Kanagawa, Kobe (Kita-ku), Tokyo (Inzai) | 3 live · 0 pipeline | ISO/IEC27001, ISO22301, PCI DSS | — |
| SoftBank Corp. / IDC Frontier | 2 | 300 MW (1 of 2 sites) | Tomakomai, Minamiboso-shi | 1 live · 1 pipeline | not published | 1 |
| DayOne | 2 | 242 | Tokyo (Inzai), Imari (Saga) | 0 live · 2 pipeline | not published | 2 |
| STACK Infrastructure | 2 | 108 | Seika (Kyoto Prefecture), Tokyo (Inzai) | 1 live · 1 pipeline | not published | — |
| NEXTDC | 2 | 30 MW (1 of 2 sites) | Tokyo (Inzai) | 0 live · 2 pipeline | not published | — |
| EdgeConneX | 2 | not published | Kyotanabe, Yawata | 0 live · 2 pipeline | not published | — |
| KDDI | 2 | not published | Sakai, Osaka, Chikura | 2 live · 0 pipeline | not published | 1 |
| Keppel DC REIT | 2 | not published | Tokyo (Inzai) | 2 live · 0 pipeline | not published | — |
| NTT DOCOMO BUSINESS (Data Centers) | 2 | not published | Osaka-Shi Kita-Ku, Ibaraki-shi | 2 live · 0 pipeline | not published | — |
| SoftBank Corp. | 1 | 140 | Sakai, Osaka | 0 live · 1 pipeline | not published | 1 |
| Princeton Digital Group | 1 | 96 | Tokyo (Inzai) | 1 live · 0 pipeline | not published | 1 |
| Vantage Data Centers | 1 | 68 | Osaka (Ibaraki) | 0 live · 1 pipeline | not published | — |
| CyrusOne | 1 | 48 | Osaka (Ibaraki) | 0 live · 1 pipeline | not published | — |
| ST Telemedia Global Data Centres | 1 | 32 | Tokyo (Inzai) | 1 live · 0 pipeline | LEED Gold, TIA-942-C Design Certification | — |
| FLOW Digital Infrastructure | 1 | 30 | Tokyo (Inzai) | 0 live · 1 pipeline | not published | — |
| Tokyu Land Corporation | 1 | 15 | Ishikari (Hokkaido) | 1 live · 0 pipeline | not published | — |
| QTnet | 1 | not published | Kasuya, Fukuoka | 1 live · 0 pipeline | not published | — |
| Qualysite Technologies | 1 | not published | Nago | 1 live · 0 pipeline | not published | — |
| SCSK | 1 | not published | Inzai-shi | 1 live · 0 pipeline | not published | — |
| TATA Communications | 1 | not published | Emi | 1 live · 0 pipeline | not published | — |
AI-ready operators in Japan
12 of 38 operators mark at least one Japan facility as AI-ready (published liquid cooling or high-density design): MC Digital Realty, NTT Communications (NTT DOCOMO BUSINESS) — Nexcenter, Colt DCS, Ada Infrastructure, NTT Global Data Centers, Telehouse, AirTrunk, SoftBank Corp. / IDC Frontier, DayOne, KDDI, SoftBank Corp., Princeton Digital Group.
See also
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FAQ
Which is the largest data center company in Japan?
By tracked facilities: Equinix with 17 sites. By published capacity: Ada Infrastructure with 601 MW. Facility counts and MW come from operator pages and registries; published megawatts describe site design, not vacant capacity for a new order.
Do all of these companies sell colocation in Japan?
No. The list includes colocation and wholesale operators as well as hyperscaler- or enterprise-owned sites that do not sell space. Open each facility card for status, certifications and the operator's own page before requesting a quote.
How is this list of Japan data center companies built?
From the Coloprice catalog: every facility is recorded from a primary source (operator website, press release, certification registry), so a company appears here when at least one of its Japan sites is tracked. No operator pays for placement, and the ranking is not for sale.
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