28 operators · 110 facilities · 2,526 MW tracked
Data center companies in Japan
28 operators run 110 tracked data centers in Japan: 92 operational, 18 under construction or announced, 2,526+ 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 28 data center operators with 110 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 2026-09-26.
Largest by tracked facilities
- Equinix 17 facilities
- Internet Initiative Japan (IIJ) 12 facilities
- NTT Communications (NTT DOCOMO BUSINESS) — Nexcenter 10 facilities
- MC Digital Realty 9 facilities
- AT TOKYO 8 facilities
Largest by published capacity
- Ada Infrastructure 601 MW published
- AirTrunk 300 MW published
- SoftBank Corp. / IDC Frontier 300 MW published
- Colt DCS 213 MW published
- MC Digital Realty 193 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 | — |
| 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 |
| MC Digital Realty | 9 | 193 | Tokyo (Inzai), Osaka (Ibaraki) | 9 live · 0 pipeline | not published | 2 |
| AT TOKYO | 8 | 40 MW (1 of 8 sites) | Tokyo (Inzai), Osaka (Ibaraki), Kasuya, Fukuoka | 8 live · 0 pipeline | not published | — |
| Colt DCS | 7 | 213 | Seika (Kyoto Prefecture), Tokyo (Inzai), Yoshikawa (Saitama) | 5 live · 2 pipeline | not published | 1 |
| 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 | — |
| Ada Infrastructure | 5 | 601 | Tokyo (Inzai), Osaka (Ibaraki) | 1 live · 4 pipeline | Uptime Institute Tier III Certification of Design Documents (TKW1-1) | 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 | — |
| Telehouse (KDDI) | 4 | 18 MW (1 of 4 sites) | Tokyo (Inzai) | 3 live · 1 pipeline | ISO 27001, JDCC Tier 4 | 1 |
| NTT Global Data Centers | 3 | 87 | Osaka (Ibaraki), Tokyo (Inzai), Seika (Kyoto Prefecture) | 2 live · 1 pipeline | not published | 2 |
| STACK Infrastructure | 2 | 108 | Seika (Kyoto Prefecture), Tokyo (Inzai) | 1 live · 1 pipeline | not published | — |
| EdgeConneX | 2 | not published | Kyotanabe, Yawata | 0 live · 2 pipeline | not published | — |
| Keppel DC REIT | 2 | not published | Tokyo (Inzai) | 2 live · 0 pipeline | not published | — |
| AirTrunk | 1 | 300 | Tokyo (Inzai) | 1 live · 0 pipeline | not published | 1 |
| SoftBank Corp. / IDC Frontier | 1 | 300 | Tomakomai | 0 live · 1 pipeline | not published | 1 |
| 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 | — |
| DayOne | 1 | 42 | Tokyo (Inzai) | 0 live · 1 pipeline | not published | 1 |
| 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 | — |
| Colt Data Centre Services | 1 | 20 | Tokyo (Inzai) | 1 live · 0 pipeline | not published | — |
| Tokyu Land Corporation | 1 | 15 | Ishikari (Hokkaido) | 1 live · 0 pipeline | not published | — |
| Telehouse | 1 | 7 | Osaka (Ibaraki) | 1 live · 0 pipeline | ISO 27001 | — |
| KDDI | 1 | not published | Sakai, Osaka | 1 live · 0 pipeline | not published | 1 |
AI-ready operators in Japan
12 of 28 operators mark at least one Japan facility as AI-ready (published liquid cooling or high-density design): NTT Communications (NTT DOCOMO BUSINESS) — Nexcenter, MC Digital Realty, Colt DCS, Ada Infrastructure, Telehouse (KDDI), NTT Global Data Centers, AirTrunk, SoftBank Corp. / IDC Frontier, SoftBank Corp., Princeton Digital Group, DayOne, KDDI.
See also
Weekly digest: prices, capacity and deals in one email.
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.
Get quotes from data center companies in Japan
Send one requirement brief and we route it to operators with matching capacity in Japan. Independent — no operator pays for position.
Need capacity in Japan? One brief, several quotes.
Request quotes →