Subnet & VLAN Provisioning Planner

Give the planner your site's container prefix, any existing allocations, and the VLANs you need (name plus size). It carves non overlapping subnets with next fit allocation, assigns the first usable address as the gateway, and renders IOS XE configuration you can paste straight into the switch: VLAN and name, SVI, DHCP excluded address range, and a DHCP pool with network, default router, dns, and lease.

• Next fit subnet allocation inside your container prefix
• No overlaps with existing allocations, natural alignment respected
• Size by host count (100) or explicit prefix (/24)
• Gateway at first usable, static range excluded from DHCP
• Rendered IOS XE config: vlan, SVI, ip dhcp pool, exclusions
• Pro: plan a whole site from CSV, export zip, saved plans

Part of CiscoTools.dev — free tools for network engineers, built by Brad McCloskey.