Subnet Calculator
Calculate IPv4 network details from an IP address and CIDR prefix instantly.
How to Use the Subnet Calculator
Enter an IPv4 address and CIDR prefix to calculate the network range, subnet mask and related address information.
Practical Example
For 192.168.1.10/24, the calculator can identify the /24 subnet mask and the network range associated with that address.
Factors That Affect the Result
The IP version, CIDR prefix, reserved addresses and whether the network is public or private determine how the result should be interpreted.
Frequently Asked Questions
What does CIDR mean?
It is notation that expresses an IP network prefix length, such as /24.
What is a subnet mask?
It identifies which portion of an IPv4 address represents the network.
Does this configure my network?
No, it calculates values for planning and reference only.
Reading IPv4 Subnet Results
A subnet calculator uses an IPv4 address and CIDR prefix to determine values such as the subnet mask, network address, broadcast address, address range, and total number of addresses. A larger prefix such as /28 creates a smaller network than /24 because more bits are reserved for the network portion.
Usable Hosts and Network Design
Traditional IPv4 subnets reserve the network and broadcast addresses, so usable-host counts can differ from the total address count. Special cases such as /31 point-to-point links and /32 host routes follow different conventions. Use the calculated range to verify whether two addresses belong to the same subnet, plan VLANs, or divide a larger network into smaller segments.
The calculator describes addressing mathematics; it does not test connectivity, firewall rules, routing, DHCP configuration, or whether an address is actually in use.