Subnet Calculator
Calculate subnet masks, network addresses, broadcast addresses, and usable host ranges for IP networks.
/24
Frequently Asked Questions
What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation shows how many bits are used for the network portion of an IP address. /24 means the first 24 bits are the network, leaving 8 bits for hosts.
What is a subnet mask?
A subnet mask determines which portion of an IP address is the network address and which is the host address. It works together with the IP address to define the network.
Why are there 2 fewer usable hosts?
In every subnet, the first address is the network address and the last is the broadcast address. Neither can be assigned to hosts, so usable hosts = total hosts - 2.