Colocationix gmbh: ColocationIX DC4

ColocationIX DC4 is located at 31 Calvinstraße, Bremen 28217, Germany. 

Operated by ColocationIX GmbH, this facility is housed in a former federal nuclear-shelter bunker, repositioned as a high-security, modern data centre.Strategically situated in Bremen, it offers an ideal Northern German connectivity hub combining secure infrastructure with strong fibre and carrier access in a non-metro-congested site. The site’s design makes it well-suited for enterprises and critical infrastructure seeking German-based colocation with elevated resilience and security.

⚙️ Facility Highlights

• Built to the European standard EN 50600 Class 4 and the U.S. standard TIA-942 Tier IV, reflecting top-tier data centre design. 
• Reported total power capacity of ~3 MW. 
• Cooling and power systems designed for redundancy (N+1) per publicly referenced specification.
• Energy-efficient cooling concept, including geothermal usage; facility claims a PUE of ~1.1 and CO₂-neutral operation. 
• Built within a 2-metre thick reinforced concrete bunker structure with high-security doors (RC 6). 

🔐 Security & Compliance

• Physical access control includes three-factor authentication: PIN/code, chip access and biometric verification. 
• Continual video surveillance across the facility (200+ cameras noted in public materials).
• Constructed with features such as permanent oxygen-reduction systems and designed to meet Critical Infrastructure (KRITIS) requirements. 
• Information security certifications: ISO 27001 and ISO 27701 for the site. 

🌐 Connectivity & Carrier Access

• The site is carrier-neutral, offering diverse fibre entries and connectivity options for enterprise clients. (PeeringDB entry notes the facility and links to ASN 61955.) 
• Service offering includes “Data Center Connect” linking from the site to major global platforms such as Equinix (Frankfurt, Düsseldorf, Paris, London) via private Express VLANs. 
• Offers cross-connects, IP transit, private cloud interconnects and hybrid cloud connectivity managed by ColocationIX. 

💼 Who It Serves

• Medium to large enterprises requiring highly secure German-based colocation infrastructure (e.g., financial services, healthcare, critical infrastructure) given the KRITIS-compliant design. 
• Companies with cloud-hybrid or multi-cloud strategies requiring low-latency links and private cloud interconnect options (via Data Center Connect) to major hyperscalers and global cloud providers.
• Organisations prioritising sustainability and energy-efficient infrastructure — DC4’s very low PUE and CO₂-neutral commitment make it attractive for companies with ESG goals.