IP Address Calculator

Calculate subnet masks, network addresses, and ranges

IP Address

Subnet Mask (CIDR)

Enter CIDR notation (e.g., 24 for /24 or 255.255.255.0)

About IP Subnetting

Subnetting is the process of dividing a network into smaller networks. CIDR (Classless Inter-Domain Routing) notation is used to specify the subnet mask, where the number after the slash represents the number of network bits.

Common CIDR Values

/24 (255.255.255.0) - 254 hosts
/16 (255.255.0.0) - 65,534 hosts
/8 (255.0.0.0) - 16,777,214 hosts