Data Center Atlas
IIJ Shiroi Data Center Campus
Operational Under construction
Japan · 2 projects · Last reported
Summary
IIJ Shiroi DCC Phase 3 Server Building
IIJ's current risk disclosure says it started constructing the third site data-center facility in Shiroi in June 2025 and discusses continuing construction investment. evidence
Internet Initiative Japan Inc. · published 2026-06-25
IIJ Shiroi Existing Operations (Phases 1 and 2)
IIJ's joint release of 26 October 2026 on a distributed quantum-computing platform, developed since 29 September 2026, states that IIJ procures, builds and operates the project's server environment at its own data centre, the Shiroi Data Center Campus in Shiroi, Chiba. This present-tense statement identifies the campus as an IIJ-operated data centre hosting current work on that date, so the existing Phase 1 and 2 operations are refreshed as operational on 26 October 2026. It gives no capacity, utilisation or new building, and the Phase 3 server building remains a separate project under construction. evidence
Internet Initiative Japan Inc. · published 2026-10-26
Location
The interactive map needs JavaScript. Display anchor: 35.79911, 140.09955 (Polygon locator, WGS 84).
View location: OpenStreetMap · Google Maps · Bing aerial · Copernicus Browser
Campus reference; individual project footprints are not mapped.
Projects (2)
IIJ Shiroi DCC Phase 3 Server Building
Under construction last observed as of · Authoritative status update
IIJ identifies the Shiroi DCC Phase 3 server building and reports maximum incoming power capacity of 10 MW, expandable to 25 MW. evidence
Internet Initiative Japan Inc. · published 2025-05-08
Power
| Metric | Stage | Value | As of | Method | Notes | Evidence |
|---|---|---|---|---|---|---|
| Grid connection | Planned | 10 MW | Reported | Source-reported 10 MW planned maximum incoming or received power capacity for the Phase 3 building. The optional 25 MW expandability ceiling is metadata only and is not a second installed, contracted, current, or additive value; neither figure is IT load, gross demand, generation, measured energy, or converted from MVA. | evidence |
Source and location review
- Status source
- Risk Factors - Management Policy evidence row
Internet Initiative Japan Inc. · published 2026-06-25 · Company disclosure - Locator
- Campus locator · Official source · official_census_small_area_address_area_polygon evidence
- Source checks
Not reviewed against imagery not_
reviewed_ for_ core_ preview
No imagery review is recorded for this project. Its status rests only on the dated authoritative source. · no independent imagery verificationStatus age at review: 124 days before the data update on 2026-10-27
IIJ Shiroi Existing Operations (Phases 1 and 2)
Operational last observed as of · Authoritative status update
Official English counterpart to the August 7 presentation identifies Matsue and Shiroi as the owned data centers among thirteen operated facilities as of August 2026. Other facilities are leased from data-center providers. PDF page 45, printed page 44. evidence
Internet Initiative Japan · published 2026-08-07
Official IR library links the FY2026 first-quarter presentation used for the current operating-inventory statement. evidence
Internet Initiative Japan · publication date not stated
- Companies
Source and location review
- Status source
- 分散量子コンピュータの実業務利用を可能にする次世代分散コンピューティング基盤の共同開発を開始 (IIJ joint press release, 26 October 2026) evidence row
Internet Initiative Japan Inc. · published 2026-10-26 · Company disclosure - Locator
- Campus locator · Official source · official_census_small_area_address_area_polygon evidence
- Source checks
Not reviewed against imagery not_
reviewed
No imagery review is recorded for this project. Its status rests only on the dated authoritative source. · no independent imagery verificationStatus age at review: 1 days before the data update on 2026-10-27
Location details
- Coordinates
- 35.79911, 140.09955
- Geometry licence
- e-stat-terms-compatible-with-CC-BY-4.0
- Use scope
- Campus locator
- Scope class
- official_census_small_area_address_area_polygon
- Authority
- Official source
- Source entity
- Address area
- Method
- estat_2020_jgd2011_exact_sakuradai_5_chome_polygon_as_campus_address_area_locator
- Derivation
- cross_source_geometry
- Precision scope
- Official e-Stat 2020 census small-area polygon for 桜台五丁目, used only as a broad address-area locator for the named campus. It is not a campus, parcel, cadastral, building, Phase 3, security, construction, or current-work boundary. The reported 55,117.019 square metres is only the selected statistical feature's area, never an IIJ campus, site, parcel, building, Phase 3, or construction area. Statistical small-area boundaries may not match general regional or administrative boundaries.
- Horizontal uncertainty
Not reported
The e-Stat download does not provide a numeric horizontal positional-accuracy statement for this selected feature.
- Geometry evidence
- f6d41f05
A locator places the site on the map. It is not a building footprint, a construction extent or a surveyed boundary unless the use scope is an official boundary, and even then it is a parcel or permit boundary.
Evidence
Sources are linked, not redistributed; each keeps its own terms. An archived copy is a lookup for the Wayback Machine capture nearest the retrieval date and may be unavailable or differ from what was reviewed. Each hash states what it covers; imported factual records are not publisher-page captures.
| Title | Publisher | Roles | Published | Retrieved | Licence | Attribution | Content hash (SHA-256) |
|---|---|---|---|---|---|---|---|
| Chiba Prefecture smoke-emitting facilities list as of 2025-03-31 Archived copy | Chiba Prefecture Government registry | Geometry identity context | rights-status-not-established | Chiba Prefecture | fee045f1879e6c2037618d6b27d5a55a67b41ad50795997448e283d3fac01b28Retained source material; see source provenance | ||
| e-Stat 2020 census small area 12232032005 (桜台五丁目) Archived copy | Portal Site of Official Statistics of Japan (e-Stat) Government statistical boundary | Geometry | not stated | e-stat-terms-compatible-with-CC-BY-4.0 | Portal Site of Official Statistics of Japan (e-Stat); Statistics Bureau of Japan; selected Shapefile feature converted to GeoJSON by Data Center Atlas | 5ba903e6c0df158856c8478867c665f9c40736fcc7be989acb035aba97c41ca8Retained source material; see source provenance | |
| IIJ Announces Plans for Phase 3 Server Building Construction, Expanding the Shiroi Data Center Campus to Meet Growing Demand for IIJ Services Archived copy | Internet Initiative Japan Inc. Company disclosure | Project and campus identity context, Grid connection observation | all-rights-reserved | Internet Initiative Japan Inc. | 7c9f965f4d6c229f0aaab2ecd4584d9943c6d6fca13ed6c528316c72956d18b8Retained source material; see source provenance | ||
| IIJ August 2026 operating data-center inventory (English) Archived copy | Internet Initiative Japan Company disclosure | Site and project identity | all-rights-reserved | Internet Initiative Japan | eaf3892b5c396dc48f5ff6f26bdc8c26e90b8bfd3597f4483e25805b2090f8e3Retained source material; see source provenance | ||
| IIJ August 2026 operating data-center inventory (Japanese) Archived copy | Internet Initiative Japan Company disclosure | Physical status, Operator claim, Owner claim | all-rights-reserved | Internet Initiative Japan | 2733b927b374cb5caee231980b53a157005501d25d7fc1979256957e0a0d1af1Retained source material; see source provenance | ||
| IIJ financial-results publication library Archived copy | Internet Initiative Japan Company disclosure | Site and project identity | not stated | all-rights-reserved | Internet Initiative Japan | 53d61c1a4ac3adb8466dad070a5dc3c539fdfd98c3abffac5df796e56bb9d5abRetained source material; see source provenance | |
| Risk Factors - Management Policy Archived copy | Internet Initiative Japan Inc. Company disclosure | Physical status | all-rights-reserved | Internet Initiative Japan Inc. | d665d479045420e991eba21ab02f6fe3bc01607cf2cb7382895427a8defb33e3Retained source material; see source provenance | ||
| 分散量子コンピュータの実業務利用を可能にする次世代分散コンピューティング基盤の共同開発を開始 (IIJ joint press release, 26 October 2026) Archived copy | Internet Initiative Japan Inc. Company disclosure | Physical status | all-rights-reserved | Internet Initiative Japan Inc. (IIJ) | 0313d9b6e311c0106355a4e8da17f1996ce5b6618a3e57937e99435cc5402fbaRetained source material; see source provenance |
Cite this site
Kyars, K. (2026). IIJ Shiroi Data Center Campus [site vcc-site-38f7e55e7e55aaed6c27]. In Data Center Atlas (2026-10-27) [Data set]. https://kiankyars.github.io/datacenter-atlas/sites/vcc-site-38f7e55e7e55aaed6c27/
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