# illumio

Source: https://startwithidentity.com/vendors/zero-trust/illumio/
Last updated: 2026-06-19
License: content by Start with Identity. Cite the source URL.

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## Overview

Illumio is the leading microsegmentation vendor in the [zero trust](https://startwithidentity.com/guides/fundamentals/what-is-zero-trust/) space. Founded in 2013 and based in Sunnyvale, it solves a different problem from user-to-app ZTNA: it isolates workloads to limit blast radius after a compromise. Rather than brokering remote user access, Illumio controls east-west, workload-to-workload traffic across data centers and cloud.

## What it is good at

Workload isolation is the core strength. Illumio maps application dependencies and enforces segmentation policy so that a compromised host cannot move laterally to reach the rest of the estate, which is directly aligned with zero-trust principles of assuming breach and minimizing lateral movement. It excels at ransomware containment, visualizes traffic flows to make policy authoring tractable, and works across hybrid data-center and cloud environments. For organizations whose primary risk is lateral spread after an initial foothold, the containment value is concrete.

## Where it falls short

Illumio is not a ZTNA replacement. It does not broker user-to-application access the way ZPA or Cloudflare do, so teams looking for secure remote access or a full SASE stack will need other tools. Microsegmentation projects are also non-trivial: mapping dependencies and authoring policy across a large estate takes effort and organizational discipline, and authentication, SSO, and MFA are outside its scope by design.

## Pricing

Quote-based enterprise licensing, not published. Cost scales with the number of protected workloads. Model it against the cost of lateral-movement incidents with the [TCO calculator](https://startwithidentity.com/tools/tco-calculator/).

## Best for, and who should look elsewhere

Choose Illumio for east-west microsegmentation and ransomware containment in data-center and cloud estates. For user-to-app zero-trust access and SASE, compare [Zscaler](https://startwithidentity.com/vendors/zero-trust/zscaler/), [Cloudflare](https://startwithidentity.com/vendors/zero-trust/cloudflare/), and [Palo Alto](https://startwithidentity.com/vendors/zero-trust/palo-alto/), and see the [zero trust category](https://startwithidentity.com/vendors/zero-trust/).

## Bottom line

The microsegmentation leader for workload isolation and ransomware containment, complementary to rather than a substitute for user-to-app ZTNA and SASE.