## Product Introduction
 
**Online IPv4 Subnet Calculator** is a powerful and easy-to-use network tool designed for users who need to parse CIDR and calculate subnet details. Whether you are a network administrator, IT professional, student, or anyone who needs to handle subnet calculations, this tool will meet your needs. It can parse CIDR with one click, allowing you to fully obtain subnet details, including network mask, network address, subnet mask, binary subnet mask, CIDR notation, wildcard mask, subnet size, first IP address, last IP address, broadcast address, and network class. With our Online IPv4 Subnet Calculator, you can quickly and accurately complete various subnet calculation tasks, enhancing work and study efficiency.
 
## Operation Guide
 
1. **Access the Tool Page**:
   Open your browser and visit our Online IPv4 Subnet Calculator page.
 
2. **Enter CIDR**:
   Enter the CIDR (Classless Inter-Domain Routing) notation you want to parse in the input box, for example, `192.168.1.0/24`.
 
3. **Automatic Parsing**:
   The tool will automatically perform the calculation and parse the entered CIDR into detailed subnet information.
 
4. **View Results**:
   The result box will display the calculated subnet details, including:
   - **Network Mask**: The network mask of the subnet.
   - **Network Address**: The network address of the subnet.
   - **Subnet Mask**: The subnet mask of the subnet.
   - **Binary Subnet Mask**: The binary representation of the subnet mask.
   - **CIDR Notation**: The CIDR notation.
   - **Wildcard Mask**: The wildcard mask of the subnet.
   - **Subnet Size**: The total number of addresses in the subnet.
   - **First IP Address**: The first IP address in the subnet.
   - **Last IP Address**: The last IP address in the subnet.
   - **Broadcast Address**: The broadcast address of the subnet.
   - **Network Class**: The network class of the subnet.
 
5. **Copy Results**:
   You can copy the results for further use, facilitating application in network configuration and management.
 
Our Online IPv4 Subnet Calculator is not only simple to operate but also efficient and accurate, ensuring that you get the most precise results in the shortest amount of time. Whether for daily study or professional work, it is an indispensable helper. Experience our Online IPv4 Subnet Calculator now and feel the convenience and efficiency of subnet calculation!