An Autonomous System Number (ASN) is a numeric identifier used in the BGP protocol to identify which autonomous system a particular prefix is originating and transiting through. NetBox support both 32- and 64- ASNs.
ASNs must be globally unique within NetBox, must each may be assigned to multiple sites.
The 32- or 64-bit AS number.
The Regional Internet Registry or similar authority responsible for the allocation of this particular ASN.
The site(s) to which this ASN is assigned.