IP Subnet Calculator
Calculate IPv4 CIDR subnet parameters, netmasks, wildcard masks, and host ranges.
CIDR Subnet Inputs
About IP Subnet Calculator
The IPv4 CIDR Subnet Calculator calculates Network Address, Broadcast Address, Usable Host IP Range, Subnet Mask, Wildcard Mask, Binary IP representation, and Total Host Capacity from any IP address and CIDR prefix (/0 to /32).
How to Use IP Subnet Calculator
Step 1
Enter an IPv4 address (e.g. 10.0.0.1) and select a CIDR prefix (e.g. /16).
Step 2
Inspect the calculated Network, Broadcast, and Host Range cards.
Step 3
Review binary subnet bitmask allocation.
Step 4
Click "Copy Summary" for your network configuration notes.
Practical Use Cases for IP Subnet Calculator
Cloud VPC & Network Engineering
Plan VPC subnet architectures and firewall security group rules for AWS VPC, Google Cloud, Azure, and Kubernetes clusters.
Network Administration & Cisco Routing
Calculate subnet masks, CIDR notations, and usable IP ranges for corporate LAN routing and DHCP server configuration.
Input & Output Examples
Calculating Subnet for 192.168.1.10/24
IP: 192.168.1.10, CIDR: /24
Network: 192.168.1.0 | Netmask: 255.255.255.0 | Usable Hosts: 192.168.1.1 - 192.168.1.254 (254 Hosts) | Broadcast: 192.168.1.255
Key Features & Performance
- ✓Calculates Network Address, Broadcast IP, Netmask, Wildcard Mask, and Usable Host Range.
- ✓Full CIDR prefix selector (/0 to /32) with live host capacity calculations.
- ✓Visualizes 32-bit Binary IP addresses and bitmask boundaries.
- ✓Identifies IP address class (Class A, B, C) and Private vs Public IP status (RFC 1918).
- ✓100% Client-Side calculation with instant reactive updates.
- ✓1-Click Copy formatted subnet summary.
Key Terminology & Definitions
CIDR (Classless Inter-Domain Routing)
A method for allocating IP addresses and IP routing using slash notation (e.g. /24) to denote the number of leading network bits in a 32-bit address.
Subnet Mask
A 32-bit number (such as 255.255.255.0) that masks an IP address and divides it into network address and host address components.