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IP Address Tools

Subnet calculator and CIDR ↔ mask converter. All calculations run client-side instantly.

↔ Subnet Mask / CIDR Converter

Enter a CIDR prefix (e.g. /24) to get the dotted-decimal mask, or enter a mask (e.g. 255.255.255.0) to get CIDR.

Result will appear here…

🌐 Subnet Calculator

Enter an IPv4 address and subnet mask to calculate network details.

Enter an IP and mask, then click Calculate.

📋 Common Subnet Masks

CIDRMask
/8255.0.0.0
/16255.255.0.0
/24255.255.255.0
/25255.255.255.128
/26255.255.255.192
/27255.255.255.224
/28255.255.255.240
/30255.255.255.252