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IP Subnet Calculator. This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) and IPv6 subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others.
The CIDR number comes from the number of ones in the subnet mask when converted to binary. The subnet mask 255.255.255.0 is 11111111.11111111.11111111.00000000 in binary. This adds up to 24 consecutive ones, or /24 (pronounced “slash twenty four”).
For Class C IP addresses, the first three octets (24 bits / 3 bytes) represent the network ID and the last octet (8 bits / 1 bytes) is the host ID. Class C IP Addresses range from 192.0.0.0 to 223.255.255.255, with a default subnet mask of 255.255.255.0 (or /24 in CIDR).
Learn about subnet masks and how they work to divide networks into smaller subnets for efficient IP address management.
This IP subnet calculator displays comprehensive information about IPv4 networks (e.g., the number of usable hosts, IP ranges, etc.) and IP addresses (e.g., private or public, class, etc.). It's useful for designing networks, troubleshooting, and helping you pass your CompTIA Network+ exam.
A subnet mask of 255.255.255.0 would give you lots of networks (2 16) and 254 hosts. A subnet of 255.255.0.0 would give you lots of hosts (approx 2 16 ) and 256 networks. A3 – the network has 8 bits and so does the node component.
The routing prefix of an address is identified by the subnet mask, written in the same form used for IP addresses. For example, the subnet mask for a routing prefix that is composed of the most-significant 24 bits of an IPv4 address is written as 255.255.255.0 .
The subnet calculator allows a subnet ID to have its final octet equal to the final octet of its subnet mask - for example, a class C network address of 192.168.0.192 with a subnet mask of 255.255.255.192 is permitted.
The smallest subnet you can create has a subnet mask of 255.255.255.252. This subnet has only 4 addresses, one network address, one broadcast address and two valid host IP addresses. This subnet is ideal for point-to-point links where we only require two usable IP addresses.
In our IP range calculator, select the relevant subnet, in this case, 255.255.255.192 /26 (the 26 is the crucial part), then in the IP address box, type 192.168.0.0. Then press calculate. The results will be displayed instantly, presenting detailed information about the first network.