A migration inventory is a structured record of where a technology is used, including systems, applications, devices, suppliers, and dependencies. It helps an organization understand what must change before upgrading or replacing technology.
In cybersecurity, a migration inventory supports safe, prioritized planning. For post-quantum cryptography, for example, it can identify products and services that rely on cryptographic algorithms that may need replacement, helping teams coordinate updates and reduce overlooked dependencies. Keeping the inventory accurate makes it easier to assess risk, assign owners, and track migration progress.