The CIDR Address Count is a browser-based cidr address count for developers and technical users who need a quick, inspectable transformation, parse, validation or encoding result. Current competitor patterns for this type of query favor tool-first pages that explain the exact rule, show a realistic example and state important limitations instead of padding the page with broad claims. The primary search intent is “cidr address count,” supported naturally by phrases such as cidr address count online, free cidr address count, online cidr address count tool, cidr address count developer tool. For IPv4, a /p prefix contains 2^(32−p) total addresses; usable-host conventions depend on network context. Use the tool by entering or pasting the requested input, reviewing the result, and checking any option that changes how the calculation or transformation is performed. The supporting content should use the same terminology as the interface so visitors can connect each field with the formula or rule being explained. It should also identify edge cases rather than implying that every possible input produces a meaningful result. Technical utilities should not confuse successful parsing or encoding with trustworthiness. Valid JSON, YAML, headers, URLs or identifiers can still be semantically wrong or unsafe in another system. Likewise, reversible encodings and classical ciphers are not substitutes for modern encryption. The page should document format assumptions, error handling and any relevant Unicode, padding, delimiter, nesting or byte-order behavior. A realistic before-and-after example should match the live interface, and users should test the output in the destination application when security or compatibility matters. Keep the working tool first, the explanation concise, and internal links limited to genuinely adjacent tasks. Once published, evaluate the page from search impressions, queries, click-through rate and ranking movement rather than repeatedly rewriting content without performance evidence. The title, H1 and opening paragraph should describe the same task so search intent and interface behavior remain aligned.
How to use this tool
CIDR address-count formula
For IPv4, total addresses = 2^(32 − prefix length). A /24 therefore contains 2⁸ = 256 total addresses.
Total addresses vs usable hosts
Traditional IPv4 subnetting often reserves the network and broadcast addresses, giving 254 conventional usable hosts in a /24. Special cases such as /31 and /32 require different interpretation.
IPv6 is different
IPv6 uses 128-bit addresses, so the corresponding total is 2^(128 − prefix). Do not apply IPv4 broadcast-address rules to IPv6.
Examples
IPv4 /24 example
A /24 leaves 8 host bits, so it contains 2⁸ = 256 total IPv4 addresses.
Common use cases
- Plan subnet sizes
- Check CIDR allocations
- Verify network documentation
- Estimate address-space capacity
Frequently asked questions
How many addresses are in a /24?
256 total IPv4 addresses.
What is the CIDR address-count formula?
For IPv4, 2^(32 − prefix length).
Does a /24 have 254 or 256 addresses?
It has 256 total addresses; 254 is the traditional usable-host count after excluding network and broadcast addresses.
How many addresses are in a /32?
One IPv4 address.
Does IPv6 use the same 32-bit formula?
No. IPv6 has 128 address bits, so total addresses are 2^(128 − prefix).