CIDR / Subnet Calculator
Enter an IPv4 address and choose a CIDR prefix to instantly calculate network details.
Status:
Waiting for input
| Network Address | |
| Broadcast Address | |
| Subnet Mask | |
| First Host | |
| Last Host | |
| Usable Hosts |
What is a subnet calculator?
A subnet calculator helps you determine the network address, broadcast address, subnet mask, and usable host range for an IPv4 address and CIDR block.
Why use subnetting?
Subnetting is used to divide IP networks into smaller segments. It helps with routing, security, network organization, and efficient address allocation.
Common use cases
- Planning internal networks
- Working with CIDR notation
- Calculating usable hosts
- Finding broadcast addresses