Subnet Calculator
IPv4 CIDR calculator — network, broadcast, hosts, netmask, and usable range.
- Network
- 192.168.1.0
- Broadcast
- 192.168.1.255
- Netmask
- 255.255.255.0
- Wildcard
- 0.0.0.255
- First host
- 192.168.1.1
- Last host
- 192.168.1.254
- Total addresses
- 256
- Usable hosts
- 254
- Class
- C
- Canonical
- 192.168.1.0/24
About the Subnet Calculator
The Subnet Calculator takes an IPv4 network in CIDR notation (like 192.168.1.0/24) or in traditional dotted-decimal netmask form and returns the network address, broadcast address, number of usable hosts, first and last host IPs, netmask, wildcard mask, and the binary representation. It handles /0 through /32 correctly, including the edge cases of /31 point-to-point links and /32 host routes.
Network administrators, systems engineers, cloud architects and CCNA/CCNP students use subnet calculators constantly — planning VPC layouts on AWS/GCP/Azure, allocating IP space for a new office, dividing a /24 into smaller subnets, or verifying that two networks don't overlap before merging. Doing subnet math by hand is easy for common /24 blocks but error-prone for anything else.
This tool also helps beginners learn subnetting by showing the binary alignment of the netmask against the network address. Once you see how the mask 'masks off' the host bits, the whole concept clicks. For subnet-heavy work, keep this open in a tab alongside your cloud console.
How to use this tool
- 1Enter the required value in the input field above (domain, IP, URL, or text depending on the tool).
- 2Click the action button to run the check — results are computed instantly from our edge network.
- 3Review the parsed output, key fields and any warnings shown in the result card.
- 4Copy the result, share the page URL, or jump to a related tool from the sidebar to continue debugging.
Key features
- CIDR and dotted-decimal netmask input
- Network address, broadcast, usable host range
- Wildcard mask (useful for ACLs)
- Handles /31 point-to-point and /32 host routes correctly