What is Colocation?

Colocation, often shortened to colo, is a hosting arrangement in which a customer places their own servers, storage, and networking equipment inside a third-party data centre. The colocation provider supplies the physical environment: a locked rack or cage, redundant power feeds with backup generators, precision cooling, and physical security including biometric access and video surveillance. The customer retains full control over the hardware and software stack, while the provider maintains the facility infrastructure.

How it works: a customer transports their equipment to the data centre, mounts it in an assigned rack, and connects to the provider's cross-connects or meet-me room to access carrier networks. The provider typically offers Service Level Agreements (SLAs) for power availability uptime (often 99.9 percent or higher), cooling temperature ranges, and network handoff reliability. Billing is usually split into a monthly recurring charge for space and power (measured by kilowatt usage or per-rack-unit) and optional add-ons like remote hands, smart hands, and additional bandwidth.

In the hosting stack, colocation sits between dedicated server leasing and cloud computing. It gives organizations direct hardware ownership for compliance, performance tuning, or legacy application support, without the capital cost of building their own data centre. It is common among enterprises, Internet service providers, content delivery networks, and financial trading firms that need low-latency access to carrier exchanges or cloud on-ramps. Compared to shared hosting or virtual private servers, colocation demands more in-house expertise but offers the highest level of physical and logical control.