The /HOST macaddress property is automatically configured by the server software, so you cannot set or change the property. The value is read and determined from the server's removable system configuration card (SCC PROM) and then stored as a property in Oracle ILOM.
The value displayed for /HOST macaddress is for the server's NET 0 port. For each additional port, the MAC addresses increments from that NET 0 value. For example, the MAC address for NET 1 is the NET 0 MAC address plus one (1).