DEVELOPER TOOL
Subnet Calculator
Calculate network addresses, broadcast addresses, host ranges, and subnet masks from any IPv4 address with CIDR notation. Split subnets and check IP ranges instantly.
Runs in your browser
Real-time results
No data sent to server
IP Address & Prefix
Visual Subnet Map
Network
Usable hosts
Broadcast
Binary Representation
N = Network bits
H = Host bits
Results
IP-in-Range Checker
Test if an IP falls within the current subnet.
Subnet Splitter
subnets
Common Subnets Reference
| CIDR | Subnet Mask | Wildcard | Total IPs | Usable Hosts |
|---|
How Subnetting Works
CIDR (Classless Inter-Domain Routing) uses a /prefix to indicate how many bits are used for the network portion. For example, /24 means 24 network bits and 8 host bits.
The subnet mask separates network and host portions of an IP. A /24 network has mask 255.255.255.0 — the first 24 bits are 1s (network) and the last 8 are 0s (hosts).
In most networks, the first address is the network ID and the last is the broadcast. Usable hosts are everything in between. A /24 gives 254 usable addresses.
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