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h4. Locally Administered MAC Addresses.
Addresses can either be universally administered addresses or locally administered addresses.
A universally administered address is uniquely assigned to a device by its manufacturer; these are sometimes called burned-in addresses. The first three octets (in transmission order) identify the organization that issued the identifier and are known as the Organizationally Unique Identifier (OUI). The following three (MAC-48 and EUI-48) or five (EUI-64) octets are assigned by that organization in nearly any manner they please, subject to the constraint of uniqueness.
A locally administered address is assigned to a device by a network administrator, overriding the burned-in address. Locally administered addresses do not contain OUIs.
Locally administered MAC addresses are commonly used for virtual network adapters, as used in virtual machines.
ClearSCADA does not support generation of licences based on locally assigned addresses as this is such addresses can not be considered globally unique.
ClearSCADA supports the generation of licences based on locally assigned addresses for versions from ClearSCADA 2015 R2 onwards.