Easily generate IPv6 SLAAC addresses using EUI-64 format. A free, client-side tool for network administrators and engineers to calculate IPv6 interface identifiers.
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IPv6 EUI-64 SLAAC Address Generator
Overview
A high-performance, single-file browser utility designed for network engineers and IT professionals to calculate IPv6 addresses derived from MAC addresses and network prefixes. This tool removes the complexity of manual EUI-64 conversion, providing instant, accurate results in a clean, professional SaaS interface.
Technical Architecture
- Framework: Pure HTML5, Tailwind CSS for styling, Vanilla JavaScript for logic.
- Storage: Strictly in-memory. No
localStorage,sessionStorage, or cookies. - Execution: All calculations occur on the client side. No API calls or external requests required.
- Dependencies: Tailwind CSS via CDN. No build step required.
Feature List
- EUI-64 Converter: Logic to convert 48-bit MAC to 64-bit EUI-64 interface identifier.
- Prefix Validation: Real-time validation of the IPv6 prefix (e.g., verifying CIDR format).
- MAC Normalization: Automatically strips delimiters (colons, hyphens) from user input.
- Bulk Generation: Allows users to input a prefix and a list of MAC addresses to generate a batch of addresses simultaneously.
- One-Click Copy: Copy-to-clipboard functionality for generated results.
- Educational Tooltips: Inline explanations of the bits being flipped (the U/L bit) and the insertion of
ff:fe.
UI/UX Design Specification
- Aesthetic: Light mode, clean typography (Inter/system sans-serif), plenty of whitespace, subtle shadows for container depth.
- Layout:
- Header: Clear, descriptive title and subtitle.
- Input Area: Two-column layout on desktop. Left column for Prefix input, Right column for MAC input.
- Action Area: Prominent blue 'Calculate' button with a subtle hover transition.
- Results Area: Card-based display of results, allowing for individual copying or bulk exporting.
- Animations:
- Micro-interactions on buttons using CSS transitions.
- Smooth fade-in for result cards.
- No jarring transitions; professional, slow-in-slow-out easing.
- Color Palette:
- Background:
#F8FAFC(Slate 50) - Cards:
#FFFFFF - Primary Action:
#2563EB(Blue 600) - Borders:
#E2E8F0(Slate 200) - Text:
#1E293B(Slate 800)
- Background:
Developer Directives
- Zero Persistence: Ensure no code calls
localStorageor related storage APIs. The tool must function perfectly in a null-origin iframe. - Sanitization: All inputs must be strictly validated. Only allow valid hexadecimal characters for MAC addresses and valid IPv6 structures for prefixes.
- Accessibility: All interactive elements must have
aria-labelattributes. Maintain high color contrast for readability. - Responsive: Use Tailwind's grid/flex utilities to ensure the tool is usable on both 320px mobile screens and large desktop monitors.
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Frequently Asked Questions
Everything you need to know about using this application.
What is the IPv6 SLAAC EUI-64 method?
The EUI-64 (Extended Unique Identifier) method is a mechanism used in Stateless Address Autoconfiguration (SLAAC) to automatically configure an IPv6 interface identifier. It takes a 48-bit MAC address, inserts a specific 16-bit sequence (ff:fe) in the middle, and flips the 7th bit of the first byte to create a 64-bit interface identifier. This process allows network devices to generate their own unique IPv6 global unicast addresses without the need for a DHCPv6 server. It is a fundamental building block of modern IPv6 networking, ensuring seamless device connectivity on local and wide area networks.
Why is this tool useful for network administrators?
Network administrators often need to verify or pre-calculate the IPv6 addresses that devices will self-assign on a network segment. Manually performing the binary operations required to flip the 7th bit of a MAC address and insert the correct padding is time-consuming and prone to human error. This tool provides an instant, accurate way to determine the full IPv6 address based on a subnet prefix and a hardware MAC address. It streamlines troubleshooting, documentation, and network planning tasks without requiring any backend connectivity or network permissions.
How does the tool ensure privacy and security?
This application operates entirely in your browser using client-side JavaScript. No data, including the MAC addresses or IPv6 prefixes you enter, is ever sent to a server, stored in a database, or tracked via cookies. The tool is fully sandboxed and maintains no state persistence between sessions. Because the tool is processed locally in your browser's memory, it is perfectly safe for use with sensitive or private network infrastructure details. You can even run this tool while completely offline, making it a secure choice for air-gapped environments or high-security data centers.
What is the difference between SLAAC and DHCPv6?
SLAAC is a stateless mechanism where devices generate their own IPv6 addresses based on prefix information broadcast by routers. It is designed to be lightweight, simple, and requires no central management server, making it the preferred method for most modern consumer and IoT devices. DHCPv6, by contrast, is a stateful mechanism similar to IPv4 DHCP, where a central server manages and tracks address assignments. While DHCPv6 offers more control for enterprise environments, it adds complexity and overhead that are often unnecessary for standard network deployments.
