IPv6 ULA Generator

Table of Contents

The IPv6 ULA Generator is a free online tool that creates RFC 4193 compliant Unique Local Address (ULA) prefixes for IPv6 networks. ULA addresses provide a standardized way to create locally routable IPv6 addresses that don’t conflict with global unicast addresses.

What is IPv6 ULA?

IPv6 Unique Local Addresses (ULA) are the IPv6 equivalent of private IPv4 addresses (like 192.168.x.x or 10.x.x.x). They use the fc00::/7 prefix space and are designed for local communication within sites or organizations without requiring global coordination.

Key Features

• RFC 4193 Compliant: Generates standards-compliant ULA prefixes
• MAC Address Input: Uses your network device’s MAC address as the seed
• Multiple Output Formats: Provides both the main ULA prefix and routable subnet blocks
• Instant Generation: Real-time creation of unique address blocks
• No Registration Required: Generate ULA addresses without centralized coordination

Main Use Cases

• Private Networks: Create IPv6 addressing schemes for internal networks
• Lab Environments: Set up test networks with unique addressing
• Enterprise Networks: Design IPv6 subnets for corporate infrastructure
• Home Networks: Configure IPv6 addressing for home lab setups
• Network Planning: Plan IPv6 deployment strategies

How to Use

1. Enter MAC Address: Input a valid MAC address (e.g., 00:1B:44:11:3A:B7) in the left field
2. Generate ULA: The tool automatically creates a unique ULA prefix
3. View Results: The right side displays:

• Main ULA prefix (e.g., fd12:3456:789a::/48)
• Available routable subnet blocks
• Network configuration details

Technical Details

The generator follows RFC 4193 specifications by:

• Using the fd00::/8 prefix for locally assigned ULA addresses
• Creating a 40-bit Global ID from the MAC address and timestamp
• Producing a /48 network prefix suitable for subnet allocation
• Ensuring statistical uniqueness across different networks

Perfect for system administrators, network engineers, and DevOps professionals working with IPv6 network design and implementation.