Enter an IPv4 address and a CIDR prefix: the tool instantly computes the network address, broadcast address, mask, wildcard mask, usable host range, IP class and binary representation. You can also split a network into subnets (VLSM) in a few clicks. No account, no uploads: everything happens in your browser.
Updated on October 13, 2026
Network address, broadcast, mask, host range, binary and subnet splitting: everything is computed as you type.
The subnet calculator is free and unlimited: as many calculations and splits as you want, no account. Everything is computed in your browser.
Network address, broadcast address, subnet mask in decimal and CIDR, wildcard mask, first and last usable IP, total number of addresses and usable hosts: every result is shown in a clear grid, computed as you type.
Calculate nowThe IP address and mask are broken down into binary bytes, with network bits in green and host bits in amber. It is the best way to visualise how a mask works and to grasp the link between the CIDR prefix and the address range.
See the binaryEnter a new prefix longer than the current one: the tool lists every subnet with its address, broadcast address and host range. Ideal for segmenting a corporate network, preparing an exam topology or planning an IoT infrastructure.
Split a networkThe tool identifies the class of the address (A, B, C, D or E) and tells you whether it is a private (RFC 1918) or public address. A quick check to confirm a device sits on a local network rather than being exposed on the internet.
Check an addressEnter the IPv4 address (e.g. 192.168.1.100) and the CIDR prefix (e.g. /24), or pick a common mask from the pills. The calculation starts as you type, with no button to click.
The grid shows the network address, broadcast address, mask, wildcard, host range, total addresses, class and type (private/public). The binary view details every network and host bit.
To segment the network, enter a new prefix (e.g. /26 for 4 subnets) and click “Split”. Each subnet shows its address, broadcast address and usable range, ready to copy.
A subnet (subnet) is a logical network carved out inside a larger IP network. Splitting lets you isolate devices, cut broadcast traffic and apply different security rules to different zones. The subnet calculator of Volade performs every IPv4 calculation locally: network address, broadcast address, mask, host range and VLSM splitting, with no account and no network request.
CIDR notation (Classless Inter-Domain Routing) expresses the mask as a prefix: /24 means 24 bits set to 1, that is 255.255.255.0. Before CIDR, classes A, B and C with fixed masks were used; CIDR replaced that system by allowing any prefix from 0 to 32. To convert, simply count the mask bits set to 1: that is the number after the slash.
To compute the network address, apply the mask with a logical AND to the IP address: the host bits are set to 0. For the broadcast address, set every host bit to 1. The first and last addresses are reserved: usable hosts start at the network address + 1 and end at the broadcast address − 1. A /24 therefore offers 254 usable addresses out of 256.
Classical fixed-length splitting (FLSM) yields subnets of identical size. The VLSM (Variable Length Subnet Mask) allows different sizes depending on your needs: a /26 for workstations, a /29 for network devices, a /30 for point-to-point links. The tool offers simple splitting by increasing the prefix, which covers most practical cases and certification exercises.
Although CIDR dominates today, classes are still useful to identify a range at a glance: a first octet of 192-223 means class C, typically used for small local networks. The three private RFC 1918 ranges (10/8, 172.16/12, 192.168/16) are not routed on the internet — a device in one of them is on local access. Always check that a network configuration object is not exposing a public address by mistake.
In CIDR notation, a /31 removes no address: it is reserved for point-to-point links (RFC 3021) and both addresses are usable. A /32 designates a single address, used for a loopback interface or a host route. The tool applies these special rules automatically. For other network configuration calculations, the regex tester checks your filtering rules, and the IP and browser module shows your current public address.
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