*** django #1
**** What is IPv6 ULA?
IPv6 Unique Local Addresses
It is used in some local place

**** Which registries did exist historically?
| 1111 1110 | L | Global ID | Subnet ID | Interface ID |
|     7     | 1 |    40     |    16     |     64       |

**** How should an IPv6 ULA registry work?
start from FC00::/7
L must be 1.
Global ID is created randomly.