IPv6 Expander/Collapser
Convert between expanded and compressed IPv6 address formats
Expand IPv6 Address
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Collapse IPv6 Address
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About IPv6 Address Formats
IPv6 addresses are 128-bit numbers, typically represented in hexadecimal format. Due to their length, IPv6 addresses can be written in different formats to make them more manageable.
Expanded Format
The expanded format of an IPv6 address consists of 8 groups of 4 hexadecimal digits, separated by colons. Each group represents 16 bits of the address.
Example: 2001:0db8:0000:0000:0000:0000:0000:0001
In this format, all leading zeros in each group are included, and no groups are omitted.
Compressed Format
The compressed format of an IPv6 address applies two rules to shorten the address:
- Leading zeros in each group can be omitted
- One or more consecutive groups of zeros can be replaced with a double colon (::)
Example: 2001:db8::1
Note: The double colon (::) can only appear once in an address to avoid ambiguity.
Common IPv6 Addresses
| Description | Compressed | Expanded |
|---|---|---|
| Loopback | ::1 | 0000:0000:0000:0000:0000:0000:0000:0001 |
| Unspecified | :: | 0000:0000:0000:0000:0000:0000:0000:0000 |
| IPv4-mapped | ::ffff:192.168.1.1 | 0000:0000:0000:0000:0000:ffff:c0a8:0101 |
| Link-local | fe80::1 | fe80:0000:0000:0000:0000:0000:0000:0001 |
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