It is strongly recommended today that any country wishing to establish a Registration Authority (RA) for allocations within that country reach agreement between the administration of an ITU Member State for the country/state (if any) and the ISO Member Body for the country/state (if any) for a given organization to do the allocations within that country using the arc {joint-iso-itu-t(2) country(16)}.  The organization may be an agency of the administration of the ITU Member State or part of the ISO Member Body, or may be an independent organization operating for both of them – in all three cases by mutual agreement (see the check-list of actions to be taken).

It can happen that a country is already operating an RA under one or more of the arcs {itu-t(0) administration(2)}, {iso(1) member-body(2)} or {joint-iso-itu-t(2) country(16)} (see the known country RAs). The values assigned to country arcs are the numeric-3 codes of ISO 3166 (without leading zeros).

It is generally recommended that preference be given to use of the arc {joint-iso-itu-t(2) country(16)}, with (if necessary), allocation of a further arc under this to a new organization to operate the extended RA facility for the country.  However, it is always important to ensure that organizations in the country are aware of what organization they should go to for a sub-allocation if there is more than one operating in the country, and the criteria that will be applied by each organization.

If a Registration Authority (RA) is to be established for a country, either at the initiative of the administration of the ITU Member State or of the ISO Member Body, the following steps need to be followed (as an application of Recommendation ITU-T X.660 | ISO/IEC 9834-1, clause A.4.5):

1. Identify the organization(s) for the administration of the ITU Member State and the ISO Member Body, and agree a contact point between them.
   Note: In the unusual case that a country/state has only an administration of the ITU Member State or only an ISO Member Body, then that organization can and will operate alone, but the letter referred to below should still be sent.
2. Determine to set up an RA for the country under arc {joint-iso-itu-t(2) country(16)} (preferably, otherwise under arc {iso(1) member-body(2)}), and agree and appoint the organization that will administer it (see "What are the duties of an RA?").
3. Agree and (if appropriate) document the criteria that will be used for the first level of allocations within the country and any charging regime that is to operate (see "Are there guidelines or standards regarding subsequent arcs of a country arc?").
4. Consider whether the top-level of allocations within the country are to be made public (placed in this OID repository or not).
   Note: There is no requirement for the allocations to be public, but backed up records should be kept, and it is recommended that preference be given to making public at least the top-level of allocations within the country .
5. Establish how organizations within the country will become aware of the criteria for getting sub-allocations (see "Which information is necessary to apply for an OID?"), and how they are to contact the RA for the country.
6. Consider whether it might be appropriate to develop a dedicated application or web-site to assist those organizations wishing to obtain allocations under the country RA.
7. Produce a letter (using the suggested template), signed by official representatives (perhaps with a seal/stamp) of the administration of the ITU Member State and the ISO Member Body.
   Note: In the case of a country arc under {iso(1) member-body(2)} the decision is only taken by the ISO National Body of the country.
8. Forward this letter to either or both of ITU-T SG 17 and ISO/IEC JTC 1/SC 6 using the contact details which should be known to the administration of the ITU Member State and the ISO Member Body.
   Note: In practice, this letter is normally forwarded to the ITU-T SG 17 ASN.1 & OID Project leader, and the Project leader will arrange for further progression.
9. The letter will in due course be recorded in the report of the relevant ITU-T SG 17 plenary meeting, and in the Resolutions of the relevant ISO/IEC JTC 1/SC 6 meeting. A copy will also be made available in this OID repository,
   Note: Receipt of the letter will not otherwise be acknowledged.
10. The country RA can then begin operation.

This is the template usually used by the administration of the ITU Member State and the ISO Member Body to appoint the organization which will operate the RA for a country. This letter shall be sent to either or both of ITU-T SG 17 and ISO/IEC JTC 1/SC 6. In practice, this letter can be forwarded to the ITU-T SG 17 ASN.1 & OID Project leader who will arrange for further progression.

The following countries are known to operate a Registration Authority. Some of them began to operate the RA many years ago and there is no record of a signed agreement.

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