IPv6 Normalizer

Normalize IPv6 addresses to RFC 5952 canonical form with lowercase, zero compression, and leading zero removal

Enter one IPv6 address per line. Supports zone identifiers (%) and IPv4-mapped addresses

RFC 5952 Normalization Rules

  • Convert hexadecimal to lowercase
  • Remove leading zeros in each group
  • Compress longest sequence of consecutive zero groups with ::
  • Preserve zone identifiers (%)
  • Support IPv4-mapped IPv6 addresses

Understanding IPv6 Address Notation

Expanded (Full) Format

Structure: All 32 hexadecimal characters with colons every 4 digits

Example: 2001:0db8:85a3:0000:0000:8a2e:0370:7334

Usage: Debugging, detailed analysis, and when precision is required

Benefits: Shows complete address structure, easier to parse programmatically

Compressed (Shortened) Format

Structure: Uses :: to represent consecutive zero groups, removes leading zeros

Example: 2001:db8:85a3::8a2e:370:7334

Usage: Configuration files, user interfaces, documentation

Benefits: Shorter, more readable, standard representation

Compression Rules

Double Colon (::): Represents one or more consecutive zero groups

Single Use: Only one :: allowed per address to avoid ambiguity

Leading Zeros: Remove leading zeros from each group (0001 → 1)

Preference: Compress the longest sequence of consecutive zeros

Conversion Use Cases & Applications

Expand IPv6 Addresses

  • Network Analysis: Compare addresses byte-by-byte
  • Database Storage: Consistent format for indexing
  • Debugging: See complete address structure
  • Programming: Easier parsing and manipulation
  • Security: Avoid address obfuscation issues

Compress IPv6 Addresses

  • User Interface: Shorter, more readable addresses
  • Configuration: Cleaner config files and logs
  • Documentation: Standard format for examples
  • URLs: Shorter addresses in IPv6 URLs
  • Network Equipment: Standard display format

Real-world Scenarios

  • Network Monitoring: Consistent address formatting
  • API Integration: Standardize input/output formats
  • Data Migration: Convert between address formats
  • Educational Tools: Demonstrate IPv6 structure
  • Quality Assurance: Validate address representations

Technical Examples & Standards

Common Address Types

Loopback:
::1 ↔ 0000:0000:0000:0000:0000:0000:0000:0001
Link-Local:
fe80::1 ↔ fe80:0000:0000:0000:0000:0000:0000:0001
Documentation:
2001:db8:: ↔ 2001:0db8:0000:0000:0000:0000:0000:0000

Best Practices

  • RFC 5952: Follow standard compression guidelines
  • Consistency: Use same format throughout applications
  • Validation: Always validate both input and output
  • Case Sensitivity: Lowercase preferred (RFC 5952)
  • Leading Zeros: Always remove for compressed form