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Revised Operating Instructions for (ENUM)

Document Type IAB Statement
Title Revised Operating Instructions for (ENUM)
Published 2019-05-02
Metadata last updated 2023-08-09
State Active
Send notices to (None)

Subject: Revised Operating Instructions for (ENUM)

Date: 2 May 2019 at 14:40:40 CEST

Dear colleagues,

The RIPE NCC is the operator of the zone (ENUM) and maintains

the associate registry in accordance with the instructions of the

Internet Architecture Board (IAB). As delegations are based on E.164

country code allocations, any changes to the registry are coordinated

with and approved by the respective holders of the E.164 country code

via the ITU’s Telecommunications Standardisation Bureau (TSB).

Recent checks have shown that over time, many of the current 57

delegations have deteriorated – they are no longer technically

functional or the contacts details for the country code registry have

not been updated.

Seeking advice from the IAB on these matters, they agreed to revise the

instructions to address these issues. Among the changes is new text

regarding the deletion of delegations and instructions that allow the

RIPE NCC to do periodic checks on registry data.

This will allow us to initiate a process to review the existing

delegations and coordinate with the registries, governments and the TSB

to mitigate and correct any errors. In cases where we are unable to

correct an error, we will advise the government involved to remove the

delegation, until such time that a new registry can assume

responsibility for the country code and restore its technical


ITU Study Group 2, which is responsible for the E.164 number registry,

shared our concerns and at its last meeting agreed to update its

instructions to the TSB to reflect these changes. As we remain committed

to coordinating any delegations with TSB, the Member States involved and

Study Group 2, we welcome the study group’s renewed interest in the

topic and its support in reviewing and updating these registrations.

The new instructions have now been published on our website and, with

the IAB’s approval, we will now operate the registry in accordance with


The instructions are available here:

Kind Regards,

Marco Hogewoning

Senior External Relations Officer, RIPE NCC,

Ted Hardie

For the IAB