Data center tier levels

Counted across the facility catalog. A facility can hold both an Uptime and a TIA-942 certificate, so the two standard counts overlap.

What the register shows

• 111 of 1259 facilities that state a level cite no certificate (9%).
• Of the 1148 certified sites, 766 are certified as built or in operation; 298 hold a design-documents certificate only.
• Most certified sites: India 92, United States 76, Indonesia 61, Brazil 50, China 44.

Certified sites by country

What the levels mean

Uptime Institute uses roman numerals (Tier III), ANSI/TIA-942 uses arabic (Rated 3). The scales are comparable in spirit but the audits are not the same — see the FAQ below.

Certification stages, strongest first

The register

Every facility in our catalog that states a level, with the standard and the stage the operator actually cites. Where the operator names no certificate, we mark it self-declared rather than repeating the label as fact.