IP Subnet Calculator
Comprehensive IPv4 and IPv6 subnetting tool with CIDR prefix notation, broadcast IP, usable host range, wildcard mask, and binary map.
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 Choose IPv4 or IPv6 Subnet mode.
- 2 Enter an IP address (e.g. 192.168.1.1 or 10.0.0.1) and select your CIDR subnet mask prefix (/8 to /32).
- 3 Click the green "Calculate ▶️" button to view the network address, broadcast address, usable host IP range, wildcard mask, and 32-bit binary breakdown.
IP Subnet Calculator — Frequently Asked Questions
Q1 What is a subnet mask and CIDR notation? ▾
A subnet mask (such as 255.255.255.0 or /24 in CIDR) is a 32-bit binary number that divides an IP address into its network routing identifier and individual device host identifier.
Q2 Why are two IP addresses subtracted from usable hosts? ▾
In standard IPv4 subnets, the lowest address (all host bits 0) is reserved as the Network ID and the highest address (all host bits 1) is reserved for Broadcast, leaving 2^(32 - CIDR) - 2 addresses for assignable client hosts.
Q3 What are the RFC 1918 Private IP Address ranges? ▾
Private ranges reserved for local networks are: 10.0.0.0/8 (10.0.0.0 - 10.255.255.255), 172.16.0.0/12 (172.16.0.0 - 172.31.255.255), and 192.168.0.0/16 (192.168.0.0 - 192.168.255.255).
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