Quick Intro to IPv6 Address Formatting
This table gives the major forms of IPv6 addresses. The most important/common are Localhost (::1), Global Unicast (usually starting with "200x"), and Link-Local Unicast (starting with "FF80").
| Address Type |
Binary Prefix |
IPv6 Notation |
| Unspecified |
00...0 (128 bits) |
::/128 |
| Loopback |
00...1 (128 bits) |
::1/128 |
| Multicast |
1111 1111 |
FF00::/8 |
| Link-Local Unicast |
1111 1110 10 |
FE80::/10 |
| ULA (*) |
1111 110 |
FC00::/7 |
| Global Unicast (**) |
001 |
2000::/3 |
| IPv4-Mapped |
00...0:1111 1111:IPv4 |
::FFFF:IPv4/128 |
| Site-Local Unicast (***) |
1111 1110 11 |
FECO::/10 |
| IPv4-compatible (***) |
00...0 (96 bits) |
::IPv4/128 |
* Unique Local Address (ULA) is an IPv6 unicast address that is generated to be unique in a local context. It is highly likely to be unique globally.
** Global Unicast address are all currently being assigned with a 2000::/3 prefix. Other three-bit prefixes are reserved for future use.
*** Site-Local Unicast and IPv4-compatible prefixes are deprecated. Use ULA and IPv4-mapped addresses, respectively.
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