IPv6 notation tool

Expand IPv6 address fdcd:2428:c455:0:c81d:de9c:8bdd:a716

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 fdcd:2428:c455:0:c81d:de9c:8bdd:a716

Expanded IPv6 address

fdcd:2428:c455:0000:c81d:de9c:8bdd:a716

Compressed IPv6

fdcd:2428:c455:0:c81d:de9c:8bdd:a716

Expanded IPv6

fdcd:2428:c455:0000:c81d:de9c:8bdd:a716

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.

1111110111001101 0010010000101000 1100010001010101 0000000000000000 1100100000011101 1101111010011100 1000101111011101 1010011100010110
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