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IP Subnet Calculator
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Enter an IP address in CIDR notation (e.g. 192.168.1.0/24) or as IP + subnet mask. Instantly calculates: network address, broadcast address, first and last usable host, subnet mask, wildcard mask, CIDR notation, IP class (A/B/C/D/E), private vs public, total and usable host count. View binary representation of the IP, mask, and network. Subnet Splitter divides any network into 2/4/8/16/32/64 equal subnets. Quick /prefix selector for /8–/32. 100% client-side.
How to Use
- 1Choose input mode: CIDR notation (e.g. 192.168.1.0/24) or IP + Subnet Mask
- 2Type your IP address and prefix, or select a quick /prefix from the dropdown
- 3Click Calculate to get the full subnet breakdown
- 4View the binary representation by expanding the Binary section
- 5Use the Subnet Splitter to divide the network into equal sub-networks
Features
- CIDR notation input (e.g. 192.168.1.0/24) or IP + subnet mask mode
- Calculates network, broadcast, first/last usable host, total & usable hosts
- Subnet mask and wildcard mask output
- IP class detection (A / B / C / D / E) and private/public status
- Binary representation of IP, subnet mask, and network address
- Subnet Splitter: divide into 2, 4, 8, 16, 32, or 64 equal subnets
- Quick /prefix selector for common masks (/8, /16, /24, /25–/32)
- Copy any result with one click
- 100% client-side - no data sent to any server
Frequently Asked Questions
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