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IPv4 Range Expander

Input a start and end IP address to find the smallest CIDR block that encompasses the entire range. Shows network address, broadcast, subnet mask, and total addresses.

Frequently Asked Questions

How does it find the CIDR?
The tool calculates the smallest power-of-two block that covers the entire start-to-end range. It finds the appropriate prefix length and aligns the network boundary.
Can the expanded range be larger than my input?
Yes, if your range does not align to a CIDR boundary, the expanded network will include additional addresses to fill the block.

Related Tools

🔢IPv4 Address Converter🌐IPv4 Subnet Calculator🌍IPv6 ULA Generator

How to Use

  1. 1 Enter a start IP address and an end IP address.
  2. 2 The tool finds the smallest CIDR block that encompasses the entire range.
  3. 3 View the network address, broadcast, subnet mask, and total addresses.
  4. 4 Note: the expanded range may be larger than your input if boundaries don't align.