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#1 Free IP Subnet Calculator 2025

🌐 IP Subnet Calculator

How to Use:

  1. Select IP Version: Choose IPv4 or IPv6.
  2. Enter IP Address: Provide the IP address you want to analyze.
  3. Enter Subnet Mask/Prefix:
    • For IPv4: Enter the subnet mask in dot-decimal notation (e.g., 255.255.255.0) or CIDR prefix (e.g., /24).
    • For IPv6: Enter the CIDR prefix length (e.g., /64).
  4. Click Calculate: View the detailed subnet information and step-by-step breakdown.
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