As I understand it must be registered there. But as i can oversee it, there are 
only Registries.

Marco

On 30 January 2025 19:42:38 CET, James Mitchell <james.mitch...@iana.org> wrote:
>My understanding is the EPP ROID is an identifier that is composed of a suffix 
>that identifies the registry/repository to which an object belongs. That 
>repository identifier should be registered in the IANA registry of EPP 
>Repository Identifiers at https://www.iana.org/assignments/epp-repository-ids. 
>I can’t speak to whether a registration is necessary for your use case – that 
>would appear to be up to those writing the (test) requirements.
>
>Thanks,
>James
>
>From: InterNetX - Marco Schrieck <marco.schri...@internetx.com>
>Organization: InterNetX GmbH
>Date: Thursday, January 30, 2025 at 7:14 AM
>To: "regext@ietf.org" <regext@ietf.org>
>Subject: [Ext] [regext] Clarification on ROID Usage for Registrars in Thin 
>Registry RDAP Implementations
>
>
>Hi All,
>
>
>
>I am writing to seek guidance on the handling of ROID (Repository Object 
>IDentifier) in RDAP implementations for registrars together with thin registry 
>models (where registrars hold domain/contact/host data). Our organization acts 
>as a registrar and is working to comply with the RDAP profile outlined in RFC 
>7483 and related 2019 updates.
>
>Context
>
>·         We operate in a thin registry environment where the registry 
>delegates RDAP queries to registrars.
>
>·         Our implementation uses registrar-generated identifiers (not ROIDs), 
>as the registry does not assign or store ROIDs.
>
>·         During RDAP testing, we encountered errors such as “globally unique 
>identifier not registered in EPPROID”, suggesting a mismatch between our 
>identifiers and ROID expectations.
>
>Questions
>
>
>1.    RFC 7483 §10.2.4 mentions roid as optional. For registrars in thin 
>models:
>2.
>
>3.    Is it acceptable to use registrar-generated handles (e.g., UUIDs) 
>instead of ROIDs in RDAP responses?
>4.
>
>
>o    Are there best practices for mapping internal registrar IDs to RDAP 
>handle or roid fields?
>o
>
>
>o    Did the 2019 discussions formalize any extensions (e.g., custom JSON 
>fields) for registrars to bypass ROID requirements?
>o
>
>o    How do we resolve errors like “identifier not registered in EPPROID” if 
>ROIDs are registry-managed but unavailable to registrars?
>§
>
>
>
>
>Thank you for your insights.
>
>Ciao
>Marco
>
>
>
>
>
>--
>
>InterNetX GmbH
>
>Johanna-Dachs-Str. 55 • 93055 Regensburg • Germany
>
>Tel. +49 941 59559-0
>
>
>
>internetx.com • internetx.com/linkedin • internetx.com/twitter
>
>
>
>Geschäftsführer:
>
>Elias Rendón Benger (CEO), Lars Krämer
>
>Amtsgericht Regensburg, HRB 7142
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