Subnet & CIDR IP Calculator
Everyday & OtherCalculate IPv4 subnet masks, CIDR network address, broadcast IP, usable host range, wildcard mask, and total usable host count for network engineering and IP planning.
Netmask: 255.255.255.0 · Usable Hosts: 254
About this calculator
Network engineers, system administrators, and cybersecurity professionals design and segment IPv4 networks using Subnet Masks and Classless Inter-Domain Routing (CIDR) prefixes.
This tool takes any IPv4 address and CIDR prefix (from /1 to /32), computing the exact network address, broadcast address, first/last usable host addresses, wildcard mask, and binary bitwise breakdown.
How It Works & Formula
Evaluates 32-bit IPv4 integers using bitwise operations: Netmask = 0xFFFFFFFF << (32 - CIDR). Network Address = IP & Netmask. Broadcast Address = Network Address | (~Netmask). Usable hosts = 2^(32 - CIDR) - 2.
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