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CIDR Calculator

Calculate network, broadcast, hosts, and masks for any IPv4 or IPv6 CIDR block.

IPv4 (/0-/32) or IPv6 (/0-/128)
Enter a valid CIDR like 192.168.1.0/24 or 2001:db8::/32

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Calculate everything about a CIDR block: network address, broadcast, subnet mask, wildcard, first and last usable host, total addresses, and a visual binary breakdown. Supports IPv4 (/0-/32) and IPv6 (/0-/128).

>[x]Features
  • -Network, broadcast, mask, wildcard, and host ranges
  • -Total and usable address counts
  • -Color-coded binary network/host breakdown
  • -Full IPv6 support with shorthand expansion
  • -Preset buttons for common blocks
>>Use Cases
  • >Designing a VPC or subnet layout
  • >Checking whether an IP is inside a subnet
  • >Calculating host capacity before provisioning
  • >Converting between CIDR and mask notation

Frequently Asked Questions

>What is a /24??
A block with 8 host bits: 256 total addresses and 254 usable hosts. The tool computes these values for any prefix from /0 to /32 (IPv4) or /128 (IPv6).
>Why is the usable count always total minus 2??
The network address (all host bits zero) and broadcast address (all host bits one) are reserved. Exceptions: /31 point-to-point links and /32 single hosts.
>Does it support IPv6??
Yes: including shorthand (::) notation. IPv6 shows the network address, host bits, and total address count.