Back to Home
CIDR Calculator
Enter an IPv4 address and prefix (e.g., 10.0.0.1 and 24) then click Calculate.
Calculate first, then choose a target prefix to list blocks inside the CIDR.
| CIDR |
First |
Last |
Usable Hosts |
Calculated addresses appear here. Large ranges are paginated; use CSV for very large blocks.
Visualizes network and host bits for the CIDR.