OID value: 1.3.6.1.2.1.3.1.1
OID description:
atEntry OBJECT-TYPE SYNTAX AtEntry ACCESS not-accessible STATUS deprecated DESCRIPTION "Each entry contains one NetworkAddress to `physical' address equivalence." INDEX { atIfIndex, atNetAddress } ::= { atTable 1 }
See also the OID Repository website reference for 1.3.6.1.2.1.3.1.1