IP Subnet Calculator
Calculate subnet information for IPv4 and IPv6 addresses
This tool helps you understand IP subnetting by calculating network addresses, broadcast addresses, and available host ranges. It supports both IPv4 and IPv6.
IPv4 Subnet Calculator
Enter an IPv4 address and either a CIDR value or subnet mask to calculate subnet information.
Enter a number between 0 and 32
Enter either CIDR or subnet mask, not both
IPv4 Subnetting Explained
Understanding how IPv4 subnetting works
What is Subnetting?
Subnetting is the process of dividing a network into smaller networks called subnets. This helps with network organization, security, and efficient use of IP addresses.
Key Concepts
- Network Address: The first address in a subnet, used to identify the subnet itself.
- Broadcast Address: The last address in a subnet, used to send data to all hosts in the subnet.
- Host Addresses: All addresses between the network and broadcast addresses that can be assigned to devices.
- Subnet Mask: A 32-bit number that determines which part of an IP address is the network portion and which is the host portion.
- CIDR Notation: A shorthand way to represent a subnet mask (e.g., /24 means 255.255.255.0).
Example
For the IP address 192.168.1.100 with a subnet mask of 255.255.255.0 (/24):
- Network Address: 192.168.1.0
- Broadcast Address: 192.168.1.255
- Usable Host Range: 192.168.1.1 to 192.168.1.254
- Total Usable Hosts: 254