Free IP Range Calculator Online - TestMu AI (Formerly LambdaTest)

What is an IP Range Calculator?

An IP Range Calculator is a tool that computes essential network details from a CIDR block or a start/end IP address range. It quickly returns the network address, broadcast address, subnet mask, first and last usable host addresses, total number of addresses, and the number of usable hosts. This helps network administrators, DevOps engineers, and IT students plan and troubleshoot IP networks efficiently.

All processing is performed locally in your browser—no data is uploaded, ensuring your network configurations remain private and secure.

Why Subnet Calculation Matters

Subnetting is a fundamental skill for network design, security, and troubleshooting. Knowing how to calculate IP ranges and subnet masks helps you:

• Design Efficient Networks: Plan IP address allocation for VLANs, subnets, and cloud VPCs without overlaps.
• Write Firewall Rules: Define IP ranges for security groups and ACLs with precision.
• Troubleshoot Connectivity: Quickly identify network and broadcast addresses to diagnose routing issues.
• Optimize Address Usage: Understand the balance between network size and host count to conserve IPv4 space.

How to Use the IP Range Calculator

Using the tool is straightforward. Follow these steps to get your network details instantly:

• Select Mode: Choose CIDR Mode if you have a network in CIDR notation (e.g., 192.168.1.0/24), or Range Mode if you have a start and end IP address.
• Enter Input: Type a valid CIDR block or the start/end IP addresses into the input fields.
• Calculate: Click the Calculate button to run the computation.
• Review Results: The output shows network address, broadcast, subnet mask, usable hosts, total hosts, IP class, and type (public/private).
• Copy Results: Use the copy buttons to copy individual values or the entire output for your documentation.

Features of the IP Range Calculator

Our IP Range Calculator is designed to be fast, accurate, and privacy‑friendly. Key features include:

• Dual Input Modes: Switch between CIDR and Range mode to fit your specific use case.
• Instant On‑Page Results: No page reloads—results appear immediately after calculation.
• Comprehensive Output: Displays network address, broadcast, subnet mask, first and last usable hosts, total hosts, usable hosts, IP class, and IP type.
• Copy Functionality: One‑click copy for each value and the full result set.
• Sample Data: Quickly load a sample CIDR or range to explore the tool's functionality.
• Privacy First: All calculations run locally in your browser—no data is sent to any server.

Use Cases for the IP Range Calculator

This tool is valuable for a wide range of professionals and students:

• Network Engineers: Plan and validate subnet designs for corporate networks, data centers, and cloud environments.
• Security Analysts: Define firewall rules and access control lists using precise IP ranges.
• DevOps & Cloud Architects: Allocate IP spaces for VPCs, subnets, and load balancers in AWS, Azure, or GCP.
• IT Students: Learn and practice subnetting concepts with instant feedback.
• System Administrators: Quickly verify network configurations and troubleshoot connectivity issues.

Check out our other network tools: IP Address Lookup, Curl to Python, and JSON to Zod.

Who Can Benefit from This Tool?

Anyone who works with IP networks can benefit from a reliable IP range calculator. It simplifies daily tasks for:

• Network Administrators: Manage IP address pools and subnet assignments efficiently.
• Cloud Engineers: Plan VPC CIDR blocks and subnet sizes for cloud deployments.
• Cybersecurity Professionals: Map network ranges for penetration testing and vulnerability assessment.
• Educators and Students: Demonstrate subnetting concepts in classroom or self-study settings.

TestMu AI (formerly LambdaTest) provides this free tool as part of our commitment to supporting developers and IT professionals with reliable, privacy‑first utilities.

Frequently Asked Questions (FAQs)

What is an IP Range Calculator?

An IP Range Calculator is a tool that computes network and host details from a CIDR block or IP address range. It returns the network address, broadcast address, subnet mask, usable host range, and total address count.

What is CIDR notation?

CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length, e.g., 192.168.1.0/24. The prefix length indicates how many bits are used for the network portion of the address.

How many usable hosts does a /24 subnet have?

A /24 subnet has 256 total addresses, but two are reserved (network and broadcast), leaving 254 usable host addresses.

What is the difference between CIDR mode and Range mode?

CIDR mode takes a network in CIDR format (e.g., 10.0.0.0/8) and computes all subnet details. Range mode takes a start and end IP and tells you the total number of addresses and their decimal equivalents.

Is the IP Range Calculator free to use?

Yes. The IP Range Calculator is completely free with instant results and no sign-up required. All calculations run in your browser – no data is uploaded.

Can I use this tool for network security planning?

Absolutely. Network engineers and security teams use subnet and IP range calculators for firewall rules, VLAN planning, and IP address management.

What does the 'IP Class' mean?

IP classes (A, B, C, D, E) are historical divisions of the IPv4 address space. Classes A, B, and C are used for unicast networks; D for multicast; and E for experimental use.

Does this calculator support IPv6?

Currently, the IP Range Calculator supports only IPv4 addresses. IPv6 support may be added in the future based on user demand.