CIDR Calculator & VLSM Planner
An interactive Classless Inter-Domain Routing (CIDR) calculator. Translate between CIDR blocks, netmasks, and host counts, plan Variable Length Subnet Mask (VLSM) structures, and aggregate routes.
CIDR Quick Converter
Please enter a valid CIDR block (e.g., 192.168.1.0/24).
| Property | Value |
|---|
VLSM Subnet Planner
Subnet a base CIDR block into optimal variable-sized subnets based on required hosts.
Invalid base network CIDR.
IP Route Summarization (Supernetting)
Input multiple subnets or IP addresses to calculate the tightest aggregate CIDR block summarizing them.
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