Subnet Calculator
Calculate subnet information from IP address and CIDR notation including network, broadcast, and host range.
How to Use Subnet Calculator
The Subnet Calculator is a free online tool for network engineers and IT professionals. Enter an IP address with CIDR notation (e.g., 192.168.1.0/24) and instantly see the network address, broadcast address, first and last usable host addresses, total number of usable hosts, and subnet mask. Whether you are planning network segmentation, configuring routers and firewalls, troubleshooting connectivity issues, studying for networking certifications (CCNA, CompTIA Network+), or designing cloud VPC subnets, this tool provides accurate subnet calculations without memorizing binary math.
Step-by-Step Instructions
- Enter an IP address with CIDR notation (e.g., 192.168.1.0/24)
- Click calculate to see all subnet information
- View network address, broadcast, host range, and subnet mask
- Copy the results for your network documentation
Related Tools
JSON Formatter and Validator
Format, validate, and pretty-print JSON with syntax highlighting.
Base64 Encoder and Decoder
Encode text to Base64 or decode Base64 strings back to plain text.
URL Encoder and Decoder
Encode special characters for URLs or decode percent-encoded strings.
HTML Entity Encoder and Decoder
Encode special characters as HTML entities or decode them back.