IPv6 notation tool

Expand IPv6 address 1221:f000::2f

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 1221:f000::2f

Expanded IPv6 address

1221:f000:0000:0000:0000:0000:0000:002f

Compressed IPv6

1221:f000::2f

Expanded IPv6

1221:f000:0000:0000:0000:0000:0000:002f

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.

0001001000100001 1111000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000101111
Compress this IPv6 address

Recent notation conversions

Recent IPv6 Expansions

Open recent IPv6 addresses to inspect their complete eight-group and binary forms.

Learn how IPv6 expansion and binary groups work