IP Subnet Calculator
IPv4 subnet calculator for network engineers: compute CIDR, subnet mask, usable host range, broadcast address, and binary bits.
IP Subnet Calculator
Calculate network address, broadcast address, usable host IP ranges, subnet masks, wildcard masks, binary representations, and CIDR blocks for IPv4 and IPv6 networks.
IPv4 Network Parameters
Usable Hosts: 254(256 total addresses)
Range: 108.177.2.1 - 108.177.2.254How IP Subnetting and CIDR Masks Work
An IPv4 address is composed of 32 bits divided into 4 octets (e.g. 192.168.1.1). Subnet masking divides these 32 bits into two parts:
- Network Identifier (Prefix bits): Shared by all devices on the same local physical or virtual network segment.
- Host Identifier: Unique address identifying an individual computer, smartphone, or router interface.
The bitwise formula to determine the network address is: Network ID = IP Address AND Subnet Mask.
RFC 1918 Private IPv4 Address Allocations
Class A Block
10.0.0.0/8
10.0.0.0 – 10.255.255.255 (16.7M hosts)
Class B Block
172.16.0.0/12
172.16.0.0 – 172.31.255.255 (1.04M hosts)
Class C Block
192.168.0.0/16
192.168.0.0 – 192.168.255.255 (65,536 hosts)
Understanding IP Subnet Calculator & Formula
The IP Subnet Calculator on CalculatorScale.com is engineered to deliver instant, mathematically verified calculations conforming strictly to standard institutional equations. Whether planning long-term investments, managing household budgets, tracking clinical fitness targets, analyzing academic genetics, calculating veterinary dosages, or converting dimensional units, every calculation updates dynamically in real time without lag.
Every formula used in this tool adheres to certified international standards, including World Health Organization biometric metrics, veterinary clinical guidelines, NIST physical conversion constants, and standard biological equations. Results are computed entirely client-side inside your browser with complete data privacy, ensuring your sensitive numbers and statistics never leave your device.
Our calculators are 100% free with no registration, subscriptions, or paywalls required. You can toggle between imperial and metric units, customize input parameters, export calculation summaries, or embed this calculator directly into your own website or blog.
How to Use the IP Subnet Calculator
- 1 Enter an IPv4 address (e.g. 192.168.1.1) and select your CIDR subnet mask prefix (/8 through /32).
- 2 Click "Calculate ▶️" to view the network address, broadcast address, usable host IP range, total host count, subnet bitmap, and wildcard mask.
IP Subnet Calculator — Frequently Asked Questions
Q1 What is CIDR notation in IP subnetting? ▾
Classless Inter-Domain Routing (CIDR) notation expresses an IP address and its subnet mask prefix length using a slash followed by the count of leading 1 bits in the mask (e.g., 192.168.1.0/24 corresponds to 255.255.255.0).
Q2 How do you determine the network ID and broadcast address? ▾
The Network ID has all host bits set to 0 in binary. The Broadcast Address has all host bits set to 1. Both are reserved and cannot be assigned to individual host devices.
Q3 How do you calculate usable host addresses per subnet? ▾
The total number of IP addresses in a subnet with h host bits is 2^h. The usable host count is 2^h - 2 (subtracting the network address and broadcast address).
Q4 What is the difference between IPv4 and IPv6 subnetting? ▾
IPv4 uses 32-bit addresses formatted as 4 decimal octets, while IPv6 uses 128-bit hexadecimal addresses divided into 8 groups of 16 bits, providing virtually inexhaustible address capacity.
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