What is Co-Location?

• What is Co-Location? A Clear Definition
• A Brief History of Co-Location
• How Does Co-Location Work?
• What is Included in a Co-Location Service?
• Co-Location vs. Dedicated Hosting vs. Cloud: Key Differences
• The Benefits of Co-Location
• Potential Drawbacks of Co-Location
• Data Center Tier Standards and What They Mean
• Who Uses Co-Location?
• What to Look for in a Co-Location Provider
• Co-Location and the Hybrid Cloud Era
• PlusClouds and Co-Location: Modern Infrastructure for Fast-Growing Businesses
• Enterprise-Grade Data Center Infrastructure
• The Leo Orchestrator: Cutting Cloud Costs by Up to 70%
• Complementing Co-Location with Cloud Automation
• Frequently Asked Questions About Co-Location
• Conclusion

In today's digitally driven world, businesses of all sizes face a common challenge: how do you maintain fast, secure, and reliable IT infrastructure without the enormous cost and complexity of building and running your own data center? The answer, for a growing number of organizations, is co-location one of the most strategic infrastructure decisions a modern business can make. So, what is co-location? Co-location is a service where businesses house their own servers and IT equipment in a third-party data center, sharing its power, cooling, and network infrastructure.

This article covers everything you need to know about co-location: what it is, how it works, what it includes, who uses it, how it compares to other hosting models, and what to look for when choosing a provider.

What is Co-Location? A Clear Definition

Co-location (also written as colocation or abbreviated to colo) is a type of data center service where a business places its own servers, storage systems, and networking equipment inside a third-party data center facility. Instead of building and maintaining its own physical infrastructure, the business rents space (typically measured in rack units, half racks, full racks, or private cages) within a professionally managed facility.

In simple terms: you own the hardware, the co-location provider owns the building and everything around it.

The co-location facility supplies:

• Physical space (rack space, cage space, or private suites) • Continuous and redundant electrical power • Advanced cooling and climate control • Physical security (access controls, surveillance, biometric entry) • High-speed internet and network connectivity • Fire suppression and environmental monitoring

The customer supplies:

• Their own servers, switches, storage devices, and other hardware • Their own operating systems, applications, and data • Remote or on-site management of that hardware

This model is sometimes called a "carrier hotel" because many telecommunications carriers also install networking equipment in co-location facilities, turning them into densely connected hubs where data from many organizations flows through shared infrastructure.

A Brief History of Co-Location

Co-location emerged in the 1990s alongside the rapid growth of the internet. Early internet service providers (ISPs) needed stable, always-on facilities to house their routers and servers, and purpose-built data centers began opening to serve that demand. As bandwidth costs fell and internet commerce boomed, enterprises began recognizing the value of housing equipment in these facilities rather than in their own office basements or server closets.

By the 2000s, co-location had become a mainstream infrastructure strategy. Today it coexists alongside cloud computing as a pillar of enterprise IT and in many hybrid scenarios, the two are used together.

How Does Co-Location Work?

The operational model of co-location is straightforward, though the technical and contractual details can be nuanced.

1. Selecting a Facility

The customer chooses a co-location data center based on factors like geographic location, network connectivity options, power capacity, tier certification, and price. Many businesses choose facilities near their headquarters for easier physical access, while others prioritize proximity to major internet exchange points (IXPs) for lower latency.

2. Renting Space

Space is rented in several ways:

Rack units (U): The smallest unit a 1U server takes up 1.75 inches of vertical rack space. Half rack: Roughly 20–25U, suitable for smaller deployments. Full rack: Typically 42U, accommodating a significant server deployment. Cage: A larger, fenced enclosure within the data center, providing more privacy and dedicated space. Cages can range from 100 to 5,000 square feet. Private suite: A fully isolated room within the facility, offering maximum security and control for enterprise or regulated workloads.

3. Shipping and Installing Hardware

The customer ships their equipment to the facility, and either the data center's technicians ("remote hands") or the customer's own staff rack and cable the hardware. The facility provides the power circuits, network patch panels, and cooling channels needed to bring the equipment online.

4. Connectivity

One of the most valuable aspects of a co-location facility is network connectivity. The customer can connect to the public internet through one or more internet service providers already present in the building, establish dedicated fiber links to their offices, or interconnect directly with cloud providers and other businesses housed in the same facility, sometimes through a meet-me room (MMR), where multiple carriers interconnect.

5. Ongoing Management

Once equipment is live, the customer manages it remotely via their own network connections. For physical tasks (rebooting a server, swapping a drive, re-cabling) they can visit in person or rely on the facility's remote hands support team.

What is Included in a Co-Location Service?

While specific offerings vary by provider, a standard co-location package typically includes:

Power

Co-location facilities provide redundant power feeds, uninterruptible power supplies (UPS), and backup diesel generators. Industry-standard setups offer N+1 or 2N power redundancy, meaning there are backup systems ready to take over instantly if the primary source fails. Many providers guarantee 99.9% or higher uptime via service level agreements (SLAs).

Cooling

Data center cooling is a precision science. Facilities use hot aisle/cold aisle containment, computer room air conditioning (CRAC) units, and in some cases liquid cooling or free-air cooling systems. Proper thermal management extends hardware life and prevents downtime.

Physical Security

Enterprise-grade security is a hallmark of co-location facilities. This typically includes:

• 24/7 on-site security staff • Multi-factor access control (key card + PIN + biometric) • CCTV surveillance with continuous recording • Mantrap entry systems (double-door airlocks) • Detailed visitor logs and escort policies

Network Connectivity

Carrier-neutral facilities offer connections to multiple internet service providers and telecoms carriers, giving customers flexibility and redundancy. Customers can choose their own ISP or purchase bandwidth directly from the facility.

Remote Hands

Most co-location providers offer remote hands support: on-site technicians who can perform basic physical tasks on your hardware at your direction (rebooting servers, cable management, visual inspections, hardware swaps) without requiring you to visit the facility.

Environmental Monitoring

Continuous monitoring of temperature, humidity, power consumption, and network activity ensures problems are detected and addressed before they cause outages.

Co-Location vs. Dedicated Hosting vs. Cloud: Key Differences

Understanding where co-location fits in the broader landscape of IT infrastructure options helps in making the right decision.

Feature	Co-Location	Dedicated Hosting	Public Cloud
Hardware ownership	Customer	Provider	Provider
Hardware control	Full	Limited	None
Scalability	Manual	Moderate	Near-instant
Cost model	CapEx + rental	OpEx	Pay-as-you-go
Physical security	Provider-managed	Provider-managed	Provider-managed
Customization	Maximum	Moderate	Limited
Network control	Full	Partial	Limited

Co-location vs. dedicated hosting: In dedicated hosting, the provider owns the servers and the customer rents them. In co-location, the customer owns the servers and rents the space. Co-location gives more control and often more cost efficiency at scale, but requires an upfront hardware investment.

Co-location vs. cloud: In the cloud, hardware is fully abstracted, customers pay for compute, storage, and bandwidth by the hour or gigabyte, with no visibility into physical machines. Co-location retains physical ownership and control, which matters for compliance, performance predictability, and total cost of ownership at high utilization levels. Crucially, with co-location, the customer always knows exactly where their hardware is located, something that is often opaque in a public cloud environment.

The Benefits of Co-Location

1. Cost Efficiency at Scale

Building a private data center requires millions in capital expenditure for the facility, power infrastructure, cooling systems, generators, security, and ongoing maintenance. Co-location eliminates this, replacing a massive capital investment with predictable operational expenses. For organizations running significant amounts of hardware, co-location is often dramatically cheaper than cloud on a per-unit-of-compute basis.

2. Full Hardware Ownership and Control

Unlike cloud or dedicated hosting, co-location customers own their equipment outright. This means no vendor lock-in on hardware, the freedom to choose and configure any server, storage, or networking equipment, and the ability to optimize hardware specifically for your workloads, GPU clusters for AI, high-frequency trading hardware for finance, or ultra-dense storage for media.

3. Enterprise-Grade Reliability

Professional co-location facilities are built to a level of reliability that most businesses could never achieve on their own. Redundant power, cooling, and connectivity (combined with Tier III or Tier IV data center certifications) deliver uptime levels of 99.9% to 99.999%.

4. Carrier Neutrality and Network Diversity

Being inside a carrier-neutral facility means access to dozens of ISPs, transit providers, CDN networks, and even direct peering with major platforms. This gives businesses the ability to negotiate the best rates and achieve the lowest latency for their specific traffic patterns.

5. Physical Security Without the Overhead

Running a secure server room in-house requires significant investment in access control, surveillance, staffing, and auditing. Co-location provides all of this as a built-in service, often exceeding what any individual company could afford independently.

6. Compliance Support

Many regulated industries (finance, healthcare, legal, government) require that data be stored in certified, audited facilities. Co-location data centers typically hold certifications such as ISO 27001, SOC 1/2/3, PCI-DSS, HIPAA, and others, making compliance significantly easier.

7. Hybrid Cloud Integration

Modern co-location facilities offer direct connections to major cloud providers like AWS, Microsoft Azure, and Google Cloud. This makes co-location a natural anchor for hybrid cloud architectures, where sensitive or high-performance workloads run on owned hardware while elastic or variable workloads burst to the cloud.

8. Disaster Recovery

Co-locating equipment in a geographically separate, professionally maintained facility provides a strong foundation for business continuity. Many organizations maintain a primary co-location site and a secondary disaster recovery (DR) site, with automated failover ensuring minimal disruption during outages.

Potential Drawbacks of Co-Location

No model is perfect. Co-location has specific trade-offs to consider:

Upfront capital cost. Purchasing servers and networking equipment requires significant initial investment, unlike cloud services which are purely operational expenses.

Physical management. While remote hands support helps, some tasks require physical presence. For teams without dedicated IT staff, this can create operational friction.

Scalability speed. Adding capacity means purchasing and shipping hardware, which takes days or weeks. Cloud services can provision new resources in minutes.

Long-term commitments. Co-location contracts often run one to three years, reducing flexibility compared to month-to-month cloud billing.

For many organizations, these trade-offs are acceptable; especially when the control, cost predictability, and performance benefits are factored in.

Data Center Tier Standards and What They Mean

When evaluating co-location providers, the Tier classification system (defined by the Uptime Institute) is a key benchmark:

Tier I: Basic infrastructure. Single path for power and cooling. 99.671% uptime (up to ~28 hours of downtime per year).

Tier II: Redundant capacity components. 99.741% uptime (~22 hours/year).

Tier III: Concurrently maintainable. Multiple power and cooling paths; only one is active. 99.982% uptime (~1.6 hours/year). This is the most common tier for enterprise co-location.

Tier IV: Fault-tolerant. All components fully redundant and independent. 99.995% uptime (~26 minutes/year). Typically used for mission-critical government or financial infrastructure.

Most enterprise co-location customers look for Tier III certified facilities as the baseline for production workloads.

Who Uses Co-Location?

Co-location is used across virtually every industry and organization size:

Mid-to-large enterprises use co-location to house core business systems (ERP, CRM, databases, communication platforms) in a secure, reliable environment without building their own data center.

Financial institutions rely on co-location for low-latency trading systems, secure customer data storage, and regulatory compliance.

Healthcare organizations house patient record systems, medical imaging data, and diagnostic platforms in co-location facilities that meet HIPAA requirements.

E-commerce businesses place their transaction processing systems and web infrastructure in carrier-neutral facilities for maximum uptime and global reach.

Media and content companies use high-density co-location for video processing, content delivery origin servers, and large-scale storage.

Technology startups use co-location when their infrastructure demands outgrow shared hosting or cloud economics, and when data sovereignty or compliance requirements demand physical control.

What to Look for in a Co-Location Provider

Choosing the right co-location partner is a long-term decision. Key factors to evaluate include:

Location and latency. How close is the facility to your team? To your customers? To major internet exchange points? Physical proximity matters for both management convenience and network performance.

Tier certification. Verify the facility's uptime certification and SLA commitments. Power capacity and redundancy. Does the facility offer the power density your hardware requires? What is the redundancy level (N+1, 2N)?

Connectivity options. Is the facility carrier-neutral? Which ISPs and cloud providers are present? Are direct connections (cross-connects) to cloud providers available?

Security certifications. Does the facility hold ISO 27001, SOC 2, PCI-DSS, or other relevant certifications?

Remote hands support. What is the response time for remote hands requests? Is 24/7 support included? Scalability. Can you start with a half rack and expand to multiple full racks or a private cage as your needs grow?

Ecosystem and community. Are other businesses you partner with or exchange data with also present in the facility? Interconnecting with them directly (cross-connect) can dramatically reduce costs and latency.

Co-Location and the Hybrid Cloud Era

The rise of public cloud computing has not diminished the relevance of co-location, if anything, it has reinforced it. Today's most sophisticated IT strategies are hybrid: combining the predictability and control of owned hardware in co-location with the elasticity of cloud services for variable workloads.

Modern co-location facilities actively support hybrid architectures by providing direct, private connections to AWS Direct Connect, Azure ExpressRoute, and Google Cloud Interconnect. This means traffic between your co-located servers and your cloud resources never touches the public internet, delivering lower latency, higher throughput, and better security than a standard cloud-only architecture.

For many enterprises, the optimal strategy is to run core, steady-state workloads on hardware they own in a co-location facility (where cost per unit of compute is significantly lower at high utilization) while using cloud resources for development environments, bursting, and globally distributed services.

PlusClouds and Co-Location: Modern Infrastructure for Fast-Growing Businesses

When it comes to leveraging co-location as part of a broader cloud and infrastructure strategy, PlusClouds stands out as a compelling partner for businesses worldwide.

PlusClouds is a cloud computing and infrastructure company, offering a portfolio of products designed to help organizations build efficient, scalable, and cost-effective IT infrastructure. Their services span public cloud, private cloud, and data center solutions, making them well-positioned to support co-location-adjacent architectures.

Enterprise-Grade Data Center Infrastructure

PlusClouds operates with Tier III data center standards, providing the redundancy and reliability that enterprise workloads demand. Their infrastructure features a 40 Gbps network backbone, full N+1 redundancy, automated backups, and a 99.9% uptime SLA, the hallmarks of a professional co-location-grade environment.

The Leo Orchestrator: Cutting Cloud Costs by Up to 70%

One of PlusClouds' flagship products is Leo, an AI-supported orchestration and automation platform. For businesses using major public cloud providers, Leo can reduce cloud infrastructure costs by up to 70% by automating resource allocation, rightsizing workloads, and eliminating waste. This is particularly relevant in hybrid co-location/cloud architectures, where the goal is to keep appropriate workloads on owned hardware (in co-location) while minimizing spend on cloud-based elastic resources.

Complementing Co-Location with Cloud Automation

For organizations using or considering co-location, PlusClouds provides the cloud management layer that makes a hybrid strategy practical. Rather than manually managing cloud costs alongside co-located hardware, businesses can use PlusClouds' Leo platform to automate, optimize, and orchestrate the cloud portion of their workload, freeing IT teams to focus on strategic initiatives rather than infrastructure maintenance.

You can explore PlusClouds' infrastructure and cloud services at plusclouds.com.

Frequently Asked Questions About Co-Location

Is co-location the same as a data center? A data center is the physical facility. Co-location is a service model within a data center, where multiple customers house their own equipment. Not all data centers offer co-location, some are single-tenant facilities operated exclusively by one company.

Is co-location suitable for small businesses? It depends on the organization's specific needs. Small businesses with modest hardware requirements often find that shared hosting or cloud services are more cost-effective. However, businesses with significant compliance requirements, specialized hardware, or high-utilization workloads may find co-location worthwhile even at smaller scale.

What is the difference between co-location and managed hosting? In managed hosting, the provider owns the hardware and manages it on your behalf. In co-location, you own the hardware and manage it yourself (with optional remote hands assistance from the provider). Co-location gives more control; managed hosting reduces operational burden.

Can I visit my equipment in a co-location facility? Yes. Co-location customers have the right to access their equipment, though they must comply with the facility's security procedures (advance notice, identification, escort policies, etc.).

What happens if my hardware fails in a co-location facility? You are responsible for replacing faulty hardware. Most co-location providers offer remote hands services to perform physical tasks like swapping drives or rebooting systems. For critical systems, businesses typically maintain spare hardware on-site or arrange expedited delivery of replacement components.

How is co-location priced? Pricing is typically based on the amount of space rented (rack units or cage space), power consumption (measured in kilowatts), and bandwidth. Contracts generally run from one to three years, with monthly pricing that reflects the length of commitment.

Conclusion

Co-location is one of the most powerful and enduring strategies in enterprise IT infrastructure. It gives organizations the reliability, security, and connectivity of a world-class data center without the prohibitive cost of building one. It preserves full ownership and control over hardware, a critical consideration for regulated industries, high-performance workloads, and businesses prioritizing data sovereignty.

As hybrid cloud architectures become the norm, co-location is evolving from a simple "rent-a-rack" model into a sophisticated interconnection hub, connecting businesses to cloud providers, telecom carriers, and each other through a single, professionally managed physical environment.

Whether you are a mid-size enterprise looking to move out of an office server room, a growing technology company needing predictable infrastructure costs, or an established organization building a hybrid cloud strategy, co-location deserves serious consideration as a core component of your IT roadmap.

And with providers like PlusClouds offering the cloud automation and orchestration tools to complement co-located infrastructure, the path to a modern, cost-efficient, and resilient hybrid architecture has never been more accessible. For more information, join our Community channel!