IPv6 Address Converter
Online IPv6 address converter with compression, expansion, prefix calculation, address type detection, and IPv4-mapped parsing
Input IPv6 Address
Conversion Options
Conversion Results
Please enter an IPv6 address
Documentation
Overview
The IPv6 address converter expands and compresses IPv6 addresses, identifies address types, calculates prefix ranges, and parses IPv4-mapped values for network operations and troubleshooting.
All IPv6 conversion and calculations run locally in your browser. Your input is not uploaded.
IPv6 Formats
Expanded format
Eight groups of four hexadecimal digits separated by colons.
2001:0db8:85a3:0000:0000:8a2e:0370:7334
Compressed format
A single :: can replace one contiguous zero run.
2001:db8:85a3::8a2e:370:7334
CIDR prefix
Append /prefix length to represent a subnet range.
2001:db8::/64
Use Cases
Network configuration review
Verify IPv6 notation to avoid mistakes caused by inconsistent compressed forms.
Firewall rule setup
Use prefix results to prepare ACL and policy ranges accurately.
Log and security troubleshooting
Identify address classes quickly and decode IPv4-mapped values.
Address planning
Estimate subnet capacity from prefix length for IPv6 allocation planning.