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Global Policy Proposal Recovered IPv4 Address Space

Comment/Reply Periods (*) Important Information Links
Comment Open: 14 March 2012
Comment Close: 4 April 2012
Close Time (UTC): 23:59 UTC Public Comment Announcement
Reply Open:   To Submit Your Comments (Forum Closed)
Reply Close:   View Comments Submitted
Close Time (UTC):   Report of Public Comments
Brief Overview
Originating Organization: Address Supporting Organization
Categories/Tags: Internet Protocol Addressing
Purpose (Brief): A Global Policy Proposal has been received by the ICANN Board for ratification. Comments are invited to inform the ICANN Board prior to the Board’s decision regarding ratification of the Proposal.
Current Status: Proposal adopted by all RIRs, verified by NRO EC and ASO AC, submitted for ratification
Next Steps: Ratification by the ICANN Board and implementation by ICANN in the performance of the IANA Functions
Staff Contact: Olof Nordling Email:
Detailed Information
Section I: Description, Explanation, and Purpose
A Global Policy Proposal has been received for ratification by the ICANN Board. The purpose of the proposal is to enable handling of IPv4 address blocks returned from any RIR and redistribution of such address blocks to the RIRs, with smaller minimum block sizes than in the existing IPv4 allocation policy. Comments are invited to inform the ICANN Board prior to the Board’s decision regarding ratification of the Proposal.
Section II: Background

The top level of the IPv4 address space was fully allocated in February 2011. The Regional Internet Registries (RIRs) have developed a policy proposal to enable redistribution of IPv4 address space returned to that pool. The proposal has been adopted by all RIRs, verified by the NRO EC and ASO AC, and submitted to the ICANN Board in line with the provisions of the ASO MoU and applicable procedures.

Section III: Document and Resource Links

Proposal text: [TXT, 3 KB]
Background report:
Board's review procedures:
ASO website with proposal overview:

Section IV: Additional Information

(*) Comments submitted after the posted Close Date/Time are not guaranteed to be considered in any final summary, analysis, reporting, or decision-making that takes place once this period lapses.

Domain Name System
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"""" is not an IDN."