Subnet Calculator
Calculate subnet information including subnet mask, network address, broadcast address, and available host range. Perfect for network planning, subnetting exercises, and IT administration.
Enter an IP address and select a subnet mask to calculate subnet information
FAQ
What is a subnet mask?
A subnet mask defines which portion of an IP address identifies the network and which identifies the host. For example, 255.255.255.0 (/24) means the first 24 bits are the network portion.
How do I determine how many subnets I need?
Calculate based on the number of hosts per subnet and total subnets required. Each additional subnet bit doubles the number of subnets but halves the hosts per subnet.
What is the wildcard mask?
A wildcard mask is the inverse of a subnet mask, used in access control lists (ACLs). For a subnet mask of 255.255.255.0, the wildcard mask is 0.0.0.255.