Dear Benjamin,

The “origin as” as observed via ARIN RDAP is a difficult-to-use relic from the past. The concept of “Autonomous System Originations” pre-dates IRR and RPKI. It was the best possible solution at that time; but since then superior solutions became available.

I submitted a policy proposal to deprecate this functionality in full: 
https://www.arin.net/participate/policy/drafts/2021_8/

Perhaps a different approach applicable to your objectives is to merge RDAP information with RPKI derived information (both in JSON format). Through this path one can achieve both a more fine-grained granularity (RPKI ROAs can be configured at routing boundaries, rather than assignment boundaries), and have greater assurances the information was produced by the Internet Number Resource holder.

A frequently updated JSON formatted view on the RPKI can be found here: https://console.rpki-client.org/vrps.json (this kind of file can also be produced by installing an RPKI validator on your own infrastructure).

Kind regards,

Job

On Wed, 26 Jan 2022 at 12:19, Benjamin Pereto via db-wg <db-wg@ripe.net> wrote:
Dear RIPE DB wg,

The RDAP for querying ip and network information on rdap.db.ripe.net is really useful.

Currently you support the rdapConformance level "rdap_level_0" and this is missing the CIDR or Prefix Information about the Length/Mask.

Other RIR have implemented a rdap conformance level "cidr0" for this:
* https://rdap.arin.net/registry/ip/9.9.9.9
* https://rdap.apnic.net/ip/1.1.1.1

with the desired information:
"cidr0_cidrs": [
{
"v4prefix": "1.1.1.0",
"length": 24
}
]

Information about the Origin ASN is also available by arin with "arin_originas0", which is also very helpful, but the format seems to be arin specific and not standardized.

May I suggest to also implement the cidr0 level, or even additionally the "origin as" for the RIPE DB RDAP?

Kind regards,
Benjamin
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