IPv6 notation tool

Expand IPv6 address fdc1:f466:301:45ee:10aa:67f0:b5f8:1189

Write any valid IPv6 address in its complete eight-group form for subnetting, binary analysis, logs, and documentation.

Example: 2001:db8::1

The conversion runs locally and does not use an external lookup service.

Expansion result

Full IPv6 notation for fdc1:f466:301:45ee:10aa:67f0:b5f8:1189

Expanded IPv6 address

fdc1:f466:0301:45ee:10aa:67f0:b5f8:1189

Compressed IPv6

fdc1:f466:301:45ee:10aa:67f0:b5f8:1189

Expanded IPv6

fdc1:f466:0301:45ee:10aa:67f0:b5f8:1189

IPv6 groups

8 groups of 4 hexadecimal digits

Address size

128 bits

Expansion rules

How IPv6 expansion works

  1. 1An IPv6 address always has eight 16-bit hexadecimal groups.
  2. 2Each visible group is left-padded with zeroes until it contains four digits.
  3. 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.

1111110111000001 1111010001100110 0000001100000001 0100010111101110 0001000010101010 0110011111110000 1011010111111000 0001000110001001
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