IP Address Generator
Free online tool to generate random IPv4/IPv6 addresses for testing, including private/public ranges and custom subnets—supports bulk export for development.
Specify ranges to exclude (CIDR or single IP)
Our IP address generator is a free utility for creating valid, random IP addresses in IPv4 or IPv6 formats, tailored for developers, testers, and network engineers needing mock data for simulations or debugging. With options for private ranges, custom subnets, and bulk output, it facilitates secure, efficient workflows—running entirely client-side to maintain privacy without external dependencies.
Common Use Cases for IP Generation
- ✓Software Testing
Populate databases or APIs with fake IPs to test IP-based features like geolocation or access controls.
- ✓Network Simulation
Create virtual networks in tools like Wireshark or Cisco Packet Tracer using generated address pools.
- ✓Load Balancing Tests
Simulate multiple client IPs for scalability testing in web servers or cloud environments.
- ✓Security Audits
Generate IPs for penetration testing or firewall rule validation without using real addresses.
- ✓Development Debugging
Mock IP assignments in local dev setups for routing, subnet, or DHCP-related issues.
- ✓Data Anonymization
Replace sensitive logs with random IPs to create safe, anonymized datasets for analysis.
Why Choose Our Generator?
IPv4 and IPv6 Support
Generate 32-bit IPv4 or 128-bit IPv6 addresses with proper formatting and validation
Range Customization
Select public, private (RFC 1918), or custom subnets; exclude invalid or reserved ranges
Bulk Generation
Create 1 to 1000+ IPs at once; output as lists, CSV, or JSON for easy import
Format Options
Decimal, binary, or hex notation; include MAC pairing for full network simulation
Real-Time Preview
Instant results with validity checks; supports sequential or random distribution
Offline Compatible
Client-side only—no servers; works in browser for secure, private use
How to Use the IP Address Generator
- Select Version: Choose IPv4, IPv6, or mixed; pick range type (public/private/custom)
- Configure Options: Enter subnet (e.g., 10.0.0.0/8), quantity (1-1000), and format (decimal/hex)
- Generate IPs: Click button for instant list; review for validity and distribution
- Validate Output: Ensure no duplicates or reserved addresses; adjust if needed
- Export Results: Copy, download CSV/JSON, or integrate directly into scripts
Understanding IP Address Generation
IPs identify devices: IPv4 (dotted decimal, 0-255 per octet) uses random Math.floor(256 * Math.random()); IPv6 generates hex segments with :: compression. Private ranges (RFC 1918) limit to non-routable addresses; custom via bit masking for subnets. Generation avoids invalid combos like all-zero networks.
Example: IPv4 private → 192.168.1.42 (from /16 range); IPv6 → 2001:db8:85a3::8a2e:370 (documentation prefix).
- IPv4 Logic: Four random bytes (0-255), exclude 0/255 in some contexts
- IPv6 Logic: Eight 16-bit hex groups; abbreviate leading zeros and consecutive ::
- Subnet Masking: Use bitwise AND for range bounds (e.g., /24 limits last octet)
Employs crypto.getRandomValues() for secure randomness; validates per RFC standards.
Advanced Features & Capabilities
Sequential Generation
Produce incrementing IPs for simulating network scans or ARP tables.
MAC-IP Pairing
Generate complementary MAC addresses for full layer 2/3 testing.
CIDR Validation
Input/validate CIDR; auto-calculate usable hosts in the range.
Frequently Asked Questions
Are generated IP addresses real?
Generated IP addresses are syntactically valid but may not correspond to real devices. They're perfect for testing and development purposes.
Can I generate private IP addresses?
Yes! You can generate private IP addresses from RFC 1918 ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) for local testing.
What's the difference between IPv4 and IPv6?
IPv4 uses 32-bit addresses (like 192.168.1.1) while IPv6 uses 128-bit addresses (like 2001:db8::1). IPv6 provides a much larger address space.
Can I specify a custom subnet?
Yes; enter CIDR notation (e.g., 192.168.1.0/24) to generate IPs within that range, ideal for targeted simulations.
Does it avoid reserved IPs?
Yes; defaults exclude loopback (127.0.0.0/8), multicast, and documentation ranges—configurable for specific needs.
Is this tool secure for sensitive projects?
Absolutely; all generation happens locally—no data transmitted or stored, ensuring privacy for dev workflows.
Privacy & Best Practices Considerations
This generator ensures safe, compliant IP creation:
- Local Security: No real IPs fetched; random gen prevents traceability
- Testing Tips: Use private ranges for internal sims; verify with ping or nmap
- Best Practices: Rotate IPs in tests; comply with RFCs for production mocks
- Related Tools: Pair with Random Phone Number Generator for full fake data
Integration & Code Examples
Generate IPs programmatically in JavaScript for apps or scripts:
JavaScript Example:
// Function to generate random IPv4
function generateIPv4() {
return Array.from({length: 4}, () =>
Math.floor(Math.random() * 256)
).join('.');
}
// For private range (e.g., 192.168.x.x)
function generatePrivateIPv4() {
const privateA = Math.floor(Math.random() * 256);
const privateB = Math.floor(Math.random() * 256);
return `192.168.${privateA}.${privateB}`;
}
// IPv6 (simplified, 8 groups of 4 hex)
function generateIPv6() {
return Array.from({length: 8}, () =>
Math.random().toString(16).substring(2,6)
).join(':');
}
// Bulk generation
function generateBulkIPs(count, type = 'ipv4') {
return Array.from({length: count}, () =>
type === 'ipv4' ? generateIPv4() : generateIPv6()
);
}
// Example usage
console.log(generateIPv4()); // e.g., '203.0.113.42'
console.log(generateBulkIPs(5, 'ipv4')); // Array of 5 IPs