Calculate range
startIp = 192.168.0.0endIp = 192.168.0.255
Result: CIDR: 192.168.0.0/24 (256 addresses)
IPv4 Range Calculator
Enter a start and end IP to find the smallest CIDR block covering the range, or enter multiple CIDRs to summarize them into the fewest covering blocks.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
What if the range is not CIDR-aligned?
The calculator will show the smallest CIDR block that fully contains the range, which may include addresses outside the specified range.
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