What Is an IP Subnet Calculator?
An IP subnet calculator helps network engineers quickly determine the network address, broadcast address, subnet mask, wildcard mask, and the range of usable host addresses for a given IP address and CIDR prefix length. This tool supports both IPv4 and IPv6 subnetting.
How Does Subnetting Work?
Subnetting divides a larger network into smaller, more manageable sub-networks (subnets). By choosing a CIDR prefix (e.g., /24 for IPv4 or /64 for IPv6), you control how many addresses are available within each subnet. A higher prefix number means fewer addresses per subnet but more subnets available.
IPv4 Subnetting
IPv4 addresses are 32-bit numbers, giving roughly 4.3 billion unique addresses. Common subnet sizes include /24 (256 addresses, 254 usable hosts), /16 (65,536 addresses), and /8 (16.7 million addresses).
IPv6 Subnetting
IPv6 addresses are 128-bit, providing a virtually unlimited address space. Standard allocations typically use /48 for organizations, /64 for individual subnets, and /128 for single host addresses.
Why Use Xitoring's Subnet Calculator?
- Instant results — no signup required
- Supports both IPv4 and IPv6
- Copy results with one click
- Identifies IP class and private address ranges
- Built by network monitoring experts