Subnet and 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.
Open the PlannerWhat it does
- 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
Frequently asked
What does the planner take as input?
A container prefix for the site, any subnets already in use, and the VLANs you need, each with a name and a size.
How are the subnets chosen?
Next-fit allocation inside the container, with no overlaps and natural alignment respected. Size each VLAN by host count or by an explicit prefix length.
What config does it produce?
Ready-to-paste IOS XE: the VLAN and name, the SVI with the first usable address as the gateway, a DHCP excluded range for the static block, and a DHCP pool with network, default router, DNS, and lease.