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IPv4 Range ⇄ CIDR
Turn a start–end IPv4 address range into the smallest list of CIDR blocks, or expand a CIDR block back into its address range.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
How it works
Range → CIDR gives the minimal ordered set of aligned blocks that exactly covers the inclusive range — the same result as `iprange`/`ipcalc` aggregation. CIDR → Range normalizes host bits and shows the first address, last address, and total count. Both directions count the network and broadcast addresses in the total.