ToolsFaction Utility
CIDR Calculator
Explore an IPv4 CIDR range without manual binary calculations.
Inspect an IPv4 CIDR block, address range, prefix length, host bits, subnet mask and total address count.
About This Tool
ToolsFaction CIDR Calculator provides a compact view of an IPv4 CIDR block. It normalizes the network address and shows the complete range, prefix length, host bits, subnet mask and total number of addresses.
How to Use
- Enter an IPv4 CIDR block.
- Select Inspect CIDR.
- Review the normalized network and range.
- Use the address count and mask for planning or documentation.
Example
Inspect 10.0.0.0/16 to see its start and end addresses and total address count.
Frequently Asked Questions
What does the prefix length represent?
It is the number of leading network bits in the 32-bit IPv4 address.
Does the calculator normalize the network?
Yes. The output CIDR begins at the calculated network address.
Does it scan the network?
No. It performs mathematical CIDR calculations only.
Is IPv6 supported?
This version is designed for IPv4.
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Browser-BasedNothing to install
Privacy FriendlyBuilt for simple use