IPv6 notation tool

Expand IPv6 address 3ffe:1900:4545:3:200:f8ff:fe21:67cf

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 3ffe:1900:4545:3:200:f8ff:fe21:67cf

Expanded IPv6 address

3ffe:1900:4545:0003:0200:f8ff:fe21:67cf

Compressed IPv6

3ffe:1900:4545:3:200:f8ff:fe21:67cf

Expanded IPv6

3ffe:1900:4545:0003:0200:f8ff:fe21:67cf

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.

0011111111111110 0001100100000000 0100010101000101 0000000000000011 0000001000000000 1111100011111111 1111111000100001 0110011111001111
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