hwL2IfHybridUnTaggedVlanListLow 1.3.6.1.4.1.2011.5.25.42.1.1.1.9.1.4

This object indicates the low-bit untagged VLANs carried in packets that can pass through the hybrid interface. There are 2048 low-bit VLANs (0-2047) and VLAN 0 is not used.