Please see Vultr's official guide for BGP customers on GitHub.
You'll find information about AS20473 Action Communities, and Informational Communities including Prefix Type and Locations.
For more information about using BGP with Vultr, see:
Configuring BGP on Vultr
Announce Your IP Space to Vultr
Using Multiple Autonomous Systems Numbers (ASNs) with Vultr
Example Letter of Authorization for BGP Announcements
Configuring BGP on Vultr With OpenBSD
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