Calculate IP subnet details including network address, broadcast, usable hosts and subnet masks
Calculators
Tool
How to Use
1Enter an IP address (e.g., 192.168.1.0)
2Select a CIDR prefix length (e.g., /24)
3The calculator will show network address, broadcast address, first and last usable IPs, total hosts, subnet mask, and wildcard mask
Frequently Asked Questions
CIDR (Classless Inter-Domain Routing) notation represents an IP address and its associated network prefix as an address followed by /prefix. For example, 192.168.1.0/24 means the first 24 bits are the network portion.
A /24 network has 256 addresses total (2^8), of which 254 are usable for hosts. The first is the network address and the last is the broadcast address.
A wildcard mask is the inverse of the subnet mask. It's used in access control lists (ACLs) and OSPF configurations. For a /24 network, the wildcard mask is 0.0.0.255.