Hi,
In VCD 5.1 we added something called "OVF Mode" which basically provides more detailed information. You can get that via REST APi by adding /ovf to the URL.
https://aneverov-ln/api/vApp/vapp-d9f3b556-f91c-49db-8bb2-35e1186016e9/ovf:
...
<ovf:Item>
<rasd:Address>00:50:56:01:01:fe</rasd:Address>
<rasd:AddressOnParent>0</rasd:AddressOnParent>
<rasd:AutomaticAllocation>true</rasd:AutomaticAllocation>
<rasd:Connection vcloud:ipAddress="192.168.6.100" vcloud:primaryNetworkConnection="true" vcloud:ipAddressingMode="POOL">extra</rasd:Connection>
<rasd:Description>PCNet32 ethernet adapter on "extra"</rasd:Description>
<rasd:ElementName>Network adapter 0</rasd:ElementName>
<rasd:InstanceID>1</rasd:InstanceID>
<rasd:ResourceSubType>PCNet32</rasd:ResourceSubType>
<rasd:ResourceType>10</rasd:ResourceType>
<vmw:Config vmw:value="true" vmw:key="connectable.allowGuestControl" ovf:required="false"/>
<vmw:Config vmw:value="true" vmw:key="wakeOnLanEnabled" ovf:required="false"/>
</ovf:Item>
Hope that helps.
/Andrii