 An IAB is ideal for organizations requiring not more than 4096 unique 48-bit numbers (EUI-48).Unlike an OUI, which allows the assignee to assign values in various different number spaces (for example, EUI-48, EUI-64, and the various context-dependent identifier number spaces, like for SNAP or EDID (VSDB field)), the Individual Address Block could only be used to assign EUI-48 identifiers.All other potential uses based on the OUI from which the IABs are allocated are reserved, and remain the property of the IEEE Registration Authority.