The arcs below "recommendation" have the value 1 to 26 with assigned identifiers of a to z. Arcs below these have the numbers of ITU-T Recommendations in the series identified by the letter. Arcs below this are determined as necessary by the ITU-T Recommendation. The identifiers a to z may be used as a "NameForm".Thus, a hypothetical OID from I.211 would start with 0.0.9.211
The arcs below "question" have values corresponding to ITU-T Study Groups, qualified by the Study Period. The value is computed by the formula:I don't know if this is worth anything now, since the study period system seems to have been discontinued.
study group number + (Period * 32)
where "Period" has the value 0 for 1984-1988, 1 for 1988-1992, etc., and the multiplier is 32 decimal.
The present list (SHORT!) of codes under this node.
A list of DNICs is in Robinton's "Telex answerback codes" document, currently an Internet-Draft.
Quoting X.680: "The arcs below "identified-organization" are assigned values by the ITU Telecommunication Standardization Bureau (TSB). Arcs below this are determined as necessary by the organizations identified by the value of the ITU."
The actual OIDs seen all start with 0.9.2342
See also the OID Repository website reference for 0