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VLAN Planning & Subnet Sizer

Define VLANs · Get Recommended Subnet Size · Check IP Address Waste

When to use: Plan VLAN segmentation strategy at project start. Enter each logical segment (users, servers, VoIP, IoT, guest) with host count to get the minimum subnet that fits without wasteful over-allocation. Helps align VLAN IDs, network names, and /prefix assignments before configuring managed switches and router ACLs.

VLAN Segments — 5 defined · 460 total hosts
VLAN IDNameHostsPurposeRecommended SubnetUsable IPsWaste
/2425454
/266212
/2512626
/27300
/2512646
Design Guidelines
Separate VoIP
Dedicated VLAN for QoS marking and priority queuing
Isolate IoT/OT
Restrict lateral movement from untrusted devices
Guest = /22 or larger
Allow for simultaneous personal devices
Server VLAN = /26–/27
Tight subnet limits broadcast domain
Management VLAN
Separate OOB management for switches, APs, UPS
Waste {"<"} 50%
Right-size subnets; over-allocation wastes RFC 1918 space