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IPv6 Expand/Compress

Expanded: 2001:0db8:0000:0000:0000:0000:0000:0001

Compressed: 2001:db8::1

About This Tool

The IPv6 Expand/Compress tool converts IPv6 addresses between their expanded (full) and compressed (shortened) forms. IPv6 addresses can be written in multiple valid formats, and this tool helps standardize them for documentation, comparison, or system requirements. Whether you need the full canonical representation or the most compact form, this tool instantly provides both formats from any valid IPv6 address input.

How to Use

  1. Enter any valid IPv6 address in the input field (can be compressed or expanded)
  2. The tool automatically displays both the expanded and compressed versions
  3. Copy the format you need for your specific use case
  4. Works with any IPv6 address format including those with zone IDs

Features

  • Accepts IPv6 addresses in any valid format
  • Displays both expanded (full 32 hexadecimal characters) and compressed forms
  • Real-time conversion as you type
  • Handles addresses with leading zeros and double colons
  • Validates IPv6 address syntax
  • Supports canonical representation standards (RFC 5952)
  • Clean output suitable for copying into configurations

Common Use Cases

  • Standardizing IPv6 addresses for documentation and reports
  • Comparing IPv6 addresses that are written in different formats
  • Converting compressed addresses to full form for database storage
  • Creating shortened versions for display in user interfaces
  • Validating IPv6 address syntax and format
  • Learning IPv6 address compression rules and patterns
  • Preparing addresses for systems that require specific formats
  • Debugging IPv6 connectivity issues by examining full addresses

Technical Details

IPv6 addresses are 128-bit identifiers written as eight groups of four hexadecimal digits separated by colons. To make them more manageable, IPv6 allows two compression techniques:

1. Leading Zero Suppression: Leading zeros within each group can be omitted.

  • Example: 2001:0db8:0000:0042 → 2001:db8:0:42

2. Double Colon Notation: Consecutive groups of zeros can be replaced with "::" (only once per address).

  • Example: 2001:db8:0:0:0:0:0:1 → 2001:db8::1
  • Example: ::1 represents 0000:0000:0000:0000:0000:0000:0000:0001 (loopback)

Expanded Form: Shows all 32 hexadecimal characters with leading zeros: 2001:0db8:0000:0000:0000:0000:0000:0001

Compressed Form: Follows RFC 5952 rules for canonical representation, using double colon notation optimally: 2001:db8::1

This tool ensures proper formatting according to IPv6 standards, making addresses consistent and easier to work with across different systems.