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IP Subnet Calculator

Calculate subnet information from CIDR notation including network addresses, broadcast addresses, subnet masks, usable IP ranges, and subnet splitting for network planning.

IP Address & CIDR

Examples:

Subnet Information

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How It Works

Privacy First

This ip subnet calculator processes your data entirely in your browser. No data is uploaded to any server, ensuring complete privacy and security.

Lightning Fast

Instant processing with real-time validation and error detection. No waiting, no delays - just immediate results.

Versatile Use Cases

  • Network planning and IP address management
  • Subnet design for VLANs and network segmentation
  • Calculating usable IP ranges for DHCP configuration

Mobile Friendly

Responsive design that works perfectly on all devices and screen sizes. Touch-friendly interface for mobile users.

Frequently Asked Questions

What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation represents an IP network using an IP address followed by a slash and the number of network bits (e.g., 192.168.1.0/24). The number after the slash indicates how many bits are used for the network portion.
How do I calculate the number of usable hosts?
The number of usable hosts equals 2^(32-CIDR) - 2. The -2 accounts for the network address (first IP) and broadcast address (last IP) which cannot be assigned to hosts.
What are private IP address ranges?
Private IP ranges are: 10.0.0.0/8 (Class A), 172.16.0.0/12 (Class B), and 192.168.0.0/16 (Class C). These addresses are not routed on the public internet and are used for internal networks.
What is a wildcard mask?
A wildcard mask is the inverse of a subnet mask. It shows which bits are ignored when matching IP addresses. It's commonly used in access control lists (ACLs) and routing protocols.
How does subnet splitting work?
Subnet splitting divides a larger network into smaller subnets by borrowing bits from the host portion. Each split requires additional network bits, reducing the number of available host addresses per subnet.

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