IPv4 Subnet & CIDR Calculator
Calculate network ID, broadcast, mask & usable host range
Class Presets:
Subnet Breakdown
Subnet Mask
255.255.255.0
254 Usable Hosts (256 Total)
Network Address:192.168.1.0
Broadcast Address:192.168.1.255
First Usable Host:192.168.1.1
Last Usable Host:192.168.1.254
Wildcard Mask:0.0.0.255
Frequently Asked Questions
Classless Inter-Domain Routing (CIDR) represents a subnet mask by counting the number of leading 1-bits in the mask. A
/24 mask corresponds to 255.255.255.0 (256 IP addresses, 254 usable hosts).
In standard IPv4 subnets, the lowest address is reserved as the Network ID, and the highest address is reserved as the Broadcast Address.