[1] Resources - ICANN ( 著, 版) https://www.icann.org/groups/ssac/documents/sac-015-en
[2] RFC 4592 - The Role of Wildcards in the Domain Name System ( ()) https://tools.ietf.org/html/rfc4592
[4] RFC 3341 - The Application Exchange (APEX) Access Service, , https://tools.ietf.org/html/rfc3341#section-3
[5] rfc1912, https://datatracker.ietf.org/doc/html/rfc1912#section-2.7