How to Audit an Existing Subnet Plan Before a Cloud Migration

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Teams preparing for cloud migration often inherit outdated network documentation, conflicting configurations, and unverified subnet allocations rather than a clean starting point. A structured audit requires gathering all router, firewall, DHCP, DNS, VPN, and cloud VPC data into a single inventory spreadsheet before any changes are made. Each subnet entry should include its CIDR, VLAN ID, gateway, DHCP range, owning team, and last-modified date to expose stale or redundant allocations. Common issues uncovered during audits include overlapping ranges from company acquisitions, oversized subnets justified by low host counts, and documentation that no longer matches live router configurations. The goal is to confirm that existing subnets remain fit for purpose and that new VPC ranges will not collide with anything carried over after cutover.

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