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批准 IANA 关于 IPv4 耗尽后 IPv4 地址分配机制的全球政策提案

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ICANN 理事会已批准地址支持组织 (ASO) 委员会于 2012 年 3 月 13 日向 ICANN 理事会提交的 IANA 关于 IPv4 耗尽后 IPv4 地址分配机制的全球政策提案。该提案已在 2012 年3 月 14 日至2012 年 4 月 4 日期间向公众征询了意见,在此期间没有收到任何意见。全球政策允许地区互联网注册管理机构将 IPv4 地址空间返回给 IANA 管理的空间池,然后将按定期日程在达到给定阈值时以决定性方式向全部五个 RIR 分配该空间池中的等份的地址空间。http://www.icann.org/en/news/in-focus/global-addressing/allocation-ipv4-post-exhaustion。ICANN 工作人员将采取一切必要的措施实施全球政策。


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Internationalized Domain Name ,IDN,"IDNs are domain names that include characters used in the local representation of languages that are not written with the twenty-six letters of the basic Latin alphabet ""a-z"". An IDN can contain Latin letters with diacritical marks, as required by many European languages, or may consist of characters from non-Latin scripts such as Arabic or Chinese. Many languages also use other types of digits than the European ""0-9"". The basic Latin alphabet together with the European-Arabic digits are, for the purpose of domain names, termed ""ASCII characters"" (ASCII = American Standard Code for Information Interchange). These are also included in the broader range of ""Unicode characters"" that provides the basis for IDNs. The ""hostname rule"" requires that all domain names of the type under consideration here are stored in the DNS using only the ASCII characters listed above, with the one further addition of the hyphen ""-"". The Unicode form of an IDN therefore requires special encoding before it is entered into the DNS. The following terminology is used when distinguishing between these forms: A domain name consists of a series of ""labels"" (separated by ""dots""). The ASCII form of an IDN label is termed an ""A-label"". All operations defined in the DNS protocol use A-labels exclusively. The Unicode form, which a user expects to be displayed, is termed a ""U-label"". The difference may be illustrated with the Hindi word for ""test"" — परीका — appearing here as a U-label would (in the Devanagari script). A special form of ""ASCII compatible encoding"" (abbreviated ACE) is applied to this to produce the corresponding A-label: xn--11b5bs1di. A domain name that only includes ASCII letters, digits, and hyphens is termed an ""LDH label"". Although the definitions of A-labels and LDH-labels overlap, a name consisting exclusively of LDH labels, such as""icann.org"" is not an IDN."