* 2020-07-13
** note
    - none
* 2020-07-10
** note
    - none
* 2020-07-08
** note
    - none
* 2020-07-06
** note
    - none
* 2020-07-04
** note
    - none
* 2020-06-28
** note
    - Research and answer the following questions: (1/2 of the time)
        - What is IPv6 ULA?
            : unique local address
            : prefix is fc00::/7
        - Which registries did exist historically?
            : RIR, LIR, NIR, AFRINIC, APNIC, ARIN, LACNIC, RIPE NCC
        - How should an IPv6 ULA registry work?
            :I do not have a idea.
