Subnet Calculator
Calculate network address, broadcast, host range, and host count from any IPv4 CIDR.
| network | 192.168.1.0 |
| broadcast | 192.168.1.255 |
| mask | 255.255.255.0 |
| firstHost | 192.168.1.1 |
| lastHost | 192.168.1.254 |
| hosts | 254 |
| total | 256 |
What is Subnet Calculator?
CIDR (Classless Inter-Domain Routing) notation expresses a subnet as IP/bits — e.g., 192.168.1.0/24 means the first 24 bits identify the network, leaving 8 bits (256 addresses) for hosts. This tool calculates everything you need to know about a subnet: network address, broadcast address, usable host range, and total addresses.
Frequently asked questions
What's /31 and /32?▼
/31 is a 2-address subnet (point-to-point links, no broadcast). /32 is a single host.
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