Subnet/CIDR Calculator Tool | Pass Your Cisco Exam! Use the Secret IP Calculator

🔢 IPv4 Subnet/CIDR Calculator

Enter IP Address / CIDR (e.g., 192.168.1.50/24)

Calculation Results

Parameter	Value (Decimal)

Tool created by **Bishhnu Banerji**

How to Use Your Subnet/CIDR Calculator

1. **Input:** Enter the target IP address followed by the CIDR notation (e.g., **172.16.0.100/20**) into the input field.
2. **Calculate:** Click the **"Calculate Subnet"** button.
3. **Analyze Results:** The table will instantly populate with crucial network information:
   • **Network Address:** The starting address of the subnet (reserved).
   • **Subnet Mask:** The mask in dotted decimal format (e.g., 255.255.255.0).
   • **Broadcast Address:** The last address of the subnet (reserved).
   • **Usable Host Range:** The first and last IPs available for devices.
4. **Error Handling:** If you enter an invalid IP or CIDR, the tool will automatically display an error message and guide you on the correct format.