We will be rolling out the 64-bit version for all existing and new Listing/Property/Room Type IDs during this time. Deployment will be done in phases from 11/16/2021 (8am PST) to 01/25/2022 (5pm PST). Make sure that you fully migrate to the new id_str fields, which are already provided alongside the old id fields (upcoming deprecations) in our APIs, webhooks and sync checks.
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Note: Thread IDs will be upgraded to 64-bit strings and changed from consecutively to randomly generated soon, see upcoming timelines: https://developer.airbnb.com/docs/string-id-migration-overview