An autonomous system (AS) is a collection of connected Internet Protocol (IP) routing prefixes under the control of one or more network operators on behalf of a single administrative entity or domain that presents a common, clearly defined routing policy to the internet.
Unique number allocated to the autonomous system. The autonomous system number (ASN) uniquely identifies each network on the Internet.
as fields are expected to be nested at:
Note also that the
as fields are not expected to be used directly at the top level.