Subnet Calculator
IP subnet details: network address, broadcast, host range, usable hosts. CIDR notation.
How to Use
Enter your values in the fields above and click Calculate to get instant results. All computations run locally in your browser. No data is ever uploaded or stored.
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IP Subnet Calculation for Networking
CalcSolver's subnet calculator takes an IP address and CIDR prefix (like 192.168.1.0/24) and computes: network address, broadcast address, subnet mask, first and last usable host, and total host count. It's an essential tool for network engineers and IT students.
For 192.168.1.0/24: network = 192.168.1.0, broadcast = 192.168.1.255, mask = 255.255.255.0, hosts = 254 (2^8 − 2). For 10.0.0.0/16: 65,534 usable hosts. For 192.168.1.0/28: only 14 hosts — perfect for a small office network segment.
Subnetting improves network performance by reducing broadcast domains, enhances security through network isolation, and makes efficient use of limited IPv4 address space. Key concept: each bit added to the prefix halves the host count. A /25 has half the hosts of a /24, a /26 has a quarter. Use CalcSolver's base converter for binary-hex IP address analysis.
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Frequently Asked Questions
What is subnetting?
Subnetting divides a large IP network into smaller subnetworks. This improves performance by reducing broadcast traffic, enhances security through isolation, and makes efficient use of IP address space.
What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation represents the subnet mask as a suffix. /24 means 24 bits for the network (255.255.255.0), /16 means 16 bits (255.255.0.0). Each bit added halves the number of hosts.
Why do we subtract 2 from the host count?
The first address in each subnet is the network address (all host bits 0) and the last is the broadcast address (all host bits 1). Neither can be assigned to a device, so usable hosts = 2^host_bits − 2.