Calculate network masks, broadcast addresses, and usable host ranges from CIDR notation.
e.g., 10.0.0.1/16 or 192.168.0.1/24
Subnetting is the practice of dividing a network into two or more smaller networks. It increases routing efficiency and enhances network security. However, calculating the precise range of IP addresses, masks, and broadcast addresses manually is error-prone.
CIDR (Classless Inter-Domain Routing) is the modern standard for IP addressing. It uses a flexible suffix (e.g., `/24`) to indicate how many bits of the IP address represent the network vs. the host.
For example, in `192.168.1.0/24`:
/32
1 IP
/30
4 IPs (2 Usable)
/24
256 IPs
/16
65,536 IPs
192.168.1.1/24
Subnet mask: 255.255.255.0, Hosts: 254
Calculates subnet details for a simple network
10.0.0.1/16
Subnet mask: 255.255.0.0, Hosts: 65534
Calculates subnet details using CIDR notation
172.16.1.1/26
Subnet mask: 255.255.255.192, Hosts: 62
Calculates subnet details for a custom network
CIDR notation is a way to represent subnet masks using a prefix length.
Use the Subnet Calculator tool to calculate subnet details such as hosts, subnet mask, and broadcast address.
Subnet mask is a 32-bit number that determines the scope of a subnet, while CIDR notation is a prefix length that represents the subnet mask.
No, the Subnet Calculator currently only supports IPv4.
Click the export button to save the results as a text file or copy them to the clipboard.
Yes, the Subnet Calculator is a free tool available for anyone to use.
The Subnet Calculator has limitations such as only supporting IPv4 and not handling complex subnet scenarios.