IP Subnet Calculator
Calculate IPv4 network, broadcast and host ranges from CIDR.
The IP Subnet Calculator takes an IPv4 address and prefix length, then computes the network, broadcast address, usable host range and subnet masks for that CIDR block.
How to use
- Enter an IPv4 address such as 192.168.1.0.
- Enter a prefix length between 0 and 32.
- Click Calculate and review the network details.
Frequently asked questions
What does /24 mean?
It means the first 24 bits are the network prefix, leaving 8 bits for 254 usable host addresses.
Why are /31 and /32 host counts zero?
Traditional IPv4 subnetting reserves network and broadcast addresses, so those prefixes report no usable hosts.
Related tools
JSON Formatter
Format, validate and minify JSON in one place.
XML Formatter
Pretty-print and indent XML documents.
YAML Formatter
Format YAML and convert between YAML and JSON in both directions.
CSV to JSON
Convert CSV tables into JSON data.
JWT Decoder
Decode JWT header, payload and expiration.
Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes.