Subnet Calculator - calculate range of IP address in subnetwork

Use IP & CIDR Netmask: 10.0.0.1/22
Or IP & Netmask:10.0.0.1 255.255.252.0
Or IP & Wildcard Mask:10.0.0.1 0.0.3.255

What is IP Address Subnetwork?

A subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a single network into two or more networks is called subnetting and the networks created are called subnetworks or subnets.

All computers that belong to a subnet are addressed with a common, identical, most-significant bit-group in their IP address. This results in the logical division of an IP address into two fields, a network or routing prefix and the rest field or host identifier. The rest field is an identifier for a specific "host" -- either a computer, or a device, or specific network interface on a computer or device.

The routing prefix is expressed in CIDR notation. It is written as the first address of a network, followed by a slash character (/), followed by the bit-length of the prefix. For example, 192.168.1.0/24 is the prefix of the Internet Protocol Version 4 network starting at the given address, having 24 bits allocated for the network prefix, and the remaining 8 bits reserved for host addressing. The IPv6 address specification 2001:db8::/32 is a large network for 296 hosts, having a 32-bit routing prefix. In IPv4 the routing prefix is also specified in the form of the subnet mask, which is expressed in quad-dotted decimal representation like an address. For example, 255.255.255.0 is the network mask for the 192.168.1.0/24 prefix.

Traffic between subnetworks is routed with special devices called routers; they provide gateways between subnetworks. As logical or physical borders between the subnets, they can be configured to either allow communication between any two IP address on the separate subnets, or prevent it.

The benefits of subnetting vary with each deployment scenario. In the address allocation architecture of the Internet using Classless Inter-Domain Routing (CIDR) and in large organizations, it is necessary to allocate address space efficiently. It may also enhance routing efficiency, or have advantages in network management when subnetworks are administratively controlled by different entities in a larger organization. Subnets may be arranged logically in a hierarchical architecture, partitioning an organization's network address space into a tree-like routing structure.

Details about subnetwork, read the document RFC 950