IP Subnet Calculator

Our IP subnet calculator is a free online tool designed for network administrators, IT professionals, and students learning about network subnetting. Calculate subnet information instantly with support for both IPv4 and IPv6 addresses.

Key Features:

• • IPv4 & IPv6 Support: Calculate subnets for both IP versions
• • CIDR Notation: Convert between CIDR and subnet mask formats
• • Network Information: Get network address, broadcast address, and IP ranges
• • Usable Hosts: Calculate the number of usable IP addresses
• • Wildcard Masks: Generate wildcard masks for ACL configuration
• • Binary Display: View IP addresses in binary format
• • IP Class Detection: Automatically identify IP address class
• • Real-time Calculation: Instant results with accurate subnet math

What is Subnetting?

Subnetting is the process of dividing a network into smaller network segments called subnets. This practice improves network performance, enhances security, and optimizes IP address allocation. Understanding subnetting is essential for network design and management.

CIDR Notation Explained

CIDR (Classless Inter-Domain Routing) notation is a compact representation of IP addresses and their routing prefix. For example, 192.168.1.0/24represents a network with 256 IP addresses (254 usable). The number after the slash indicates how many bits are used for the network portion.

Common Subnet Masks