Calculate network address, broadcast address, subnet mask, and host range from any IPv4 address and CIDR notation.
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Whether you're configuring a home network or managing enterprise infrastructure, understanding IP subnetting is essential. Our IP Subnet Calculator instantly breaks down any IPv4 address and CIDR notation into all the details you need.
Subnetting divides a large network into smaller, more manageable segments. Each subnet has its own network address, broadcast address, and range of usable host IPs. CIDR notation (like /24) specifies how many bits are used for the network portion.
The Core Concept
Plan VLANs and network segments for your infrastructure.
Calculate ranges for ACLs and security rules.
Determine host ranges for DHCP server configuration.
Practice subnetting for CCNA, CompTIA, and other IT exams.
Instantly see network ranges without manual binary math.
Prevent misconfiguration with accurate subnet calculations.
See the binary representation to understand how subnetting works.
CIDR (Classless Inter-Domain Routing) notation like /24 indicates how many bits are used for the network portion. /24 means 24 bits for network (256 addresses), /25 is 128 addresses, /26 is 64, and so on.
In most subnets, the first address is reserved for the network address and the last for the broadcast address. A /24 has 256 addresses but only 254 usable hosts.
The wildcard mask is the inverse of the subnet mask, used in ACLs (Access Control Lists) on routers and firewalls. It indicates which bits should be ignored when matching.
Private IPs are non-routable on the public internet: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. These are used for internal networks and require NAT to reach the internet.
For interactive subnet visualization, network diagrams, and a comprehensive suite of network utilities, check out NetYogi's Subnet Calculator. It provides detailed visual breakdowns of network ranges and advanced analysis features.