Expansion result
Full IPv6 notation for ::cd
Expanded IPv6 address
0000:0000:0000:0000:0000:0000:0000:00cd
Compressed IPv6
::cd
Expanded IPv6
0000:0000:0000:0000:0000:0000:0000:00cd
IPv6 groups
8 groups of 4 hexadecimal digits
Address size
128 bits
IPv6 notation tool
Expand IPv6 address ::cd
Write any valid IPv6 address in its complete eight-group form for subnetting, binary analysis, logs, and documentation.
Example: 2001:db8::1
Expansion rules
How IPv6 expansion works
- 1An IPv6 address always has eight 16-bit hexadecimal groups.
- 2Each visible group is left-padded with zeroes until it contains four digits.
- 3If :: appears, it is replaced with the number of 0000 groups needed to reach eight groups.
Binary representation
128 bits, grouped for inspection
Each block below represents one 16-bit IPv6 group. This form is useful when comparing prefix bits or troubleshooting subnet boundaries.
0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000011001101Recent notation conversions
Recent IPv6 Expansions
Open recent IPv6 addresses to inspect their complete eight-group and binary forms.