[atlas] Assigned AS vs. Advertising AS

Hi Gert,

thanks for your clarification! But you still get my point, do you?
If a prefix was assigned to an entity other than the one that is advertising the prefix, for example: 80.187.128.0/22

Announcing: Deutsche Telekom AG (AS3320)
Assigned: T-Mobile Deutschland GmbH (AS44178)

The information (original prefix receiver) is stored in the RIPE DB, right? It could be compared to what we see via BGP.
I am aware that a single entity can have multiple AS numbers, but when different entities are "involved", more transparency would be great.

Or am i missing something here?

BR,
Simon

On 29.06.22 10:54, Gert Doering wrote:
> Hi,
>
> On Wed, Jun 29, 2022 at 10:30:22AM +0200, Simon Brandt via ripe-atlas wrote:
>> Another example would be a multi ASN company which announces all
>> prefixes from a single ASN via BGP, even though the prefixes are
>> assigned to various AS numbers. Since the RIRs do have the information,
>> to which AS a specific prefix is assigned to,
> prefixes are not assigned to "AS" numbers, ever.
>
> prefixes are assigned to entities, as are AS numbers.
>
> ROAs and/or route(6): objects are used to tie both together - and it's
> in the authority of the network (prefix) holder to state which AS is
> allowed and expected to announce a given prefix, not the RIR.
>
> Repeat: the RIR has no say in "which AS is tied a prefix".
>
> Gert Doering
>          -- NetMaster
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