Network tool
Subnet Calculator
Compute the network and broadcast addresses, usable host range, subnet mask, and host count for any IPv4 CIDR block, instantly, in your browser.
Subnet Calculator
Enter an IPv4 address with prefix length, e.g. , , , ,
Frequently asked questions
What is a /24 subnet and how many hosts does it support?
A /24 subnet (subnet mask 255.255.255.0) provides 256 total IP addresses. Two are reserved, the network address (e.g. 192.168.1.0) and the broadcast address (e.g. 192.168.1.255), leaving 254 usable host addresses. /24 subnets are the most common choice for small office LANs. For larger offices, consider /23 (510 usable hosts) or segment with VLANs.
How do I choose the right subnet size for my office network?
Start by counting the maximum number of devices that will be on the network: including workstations, phones, printers, IoT devices, and servers, and add 25–50% growth headroom. Choose the smallest CIDR block that comfortably fits that count. For most offices under 200 devices, a /24 (254 hosts) is standard. Separate voice, data, IoT, and management traffic into VLANs with their own subnets for security and performance, even if each subnet is small.
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