IPv6 notation tool

Expand IPv6 address 0:1e5::a:21:1:acf

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

Example: 2001:db8::1

Expansion result

Full IPv6 notation for 0:1e5::a:21:1:acf

Expanded IPv6 address

0000:01e5:0000:0000:000a:0021:0001:0acf

Compressed IPv6

0:1e5::a:21:1:acf

Expanded IPv6

0000:01e5:0000:0000:000a:0021:0001:0acf

IPv6 groups

8 groups of 4 hexadecimal digits

Address size

128 bits

Expansion rules

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

Each block below represents one 16-bit IPv6 group. This form is useful when comparing prefix bits or troubleshooting subnet boundaries.

0000000000000000 0000000111100101 0000000000000000 0000000000000000 0000000000001010 0000000000100001 0000000000000001 0000101011001111

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Recent notation conversions

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