IPv4 Range Expander
Find the smallest CIDR subnet that contains your IP range. Enter start and end IP addresses to calculate the optimal network configuration.
📝 IP Range Input
💡 Instructions：
• Input start and end IP addresses
• System automatically calculates the smallest subnet containing the range
• If end IP is less than start IP, click the swap button
• Click result to copy to clipboard
• Input start and end IP addresses
• System automatically calculates the smallest subnet containing the range
• If end IP is less than start IP, click the swap button
• Click result to copy to clipboard
📊 Calculate Result
Input IP Range and click Calculate to view Result
⚠️ Range Expansion Instructions：
• Start Address: Adjusted range start IP (aligned to subnet boundary)
• End Address: Adjusted range end IP (aligned to subnet boundary)
• Address Quantity: Total IP addresses in the range
• CIDR: Smallest valid subnet containing the range
• Start Address: Adjusted range start IP (aligned to subnet boundary)
• End Address: Adjusted range end IP (aligned to subnet boundary)
• Address Quantity: Total IP addresses in the range
• CIDR: Smallest valid subnet containing the range