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+*** 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.