Your question is ambiguous. First you will have to state which energy scale you are talking about. Generally, you would express band positions in relation to either vacuum level or Fermi level. However in both cases this is very much a function of deposition parameters of your material and can not be expressed for ITO in general.

In either case, the question would be more suitably expressed in a different way. In case of conduction band position in relation to Fermi level, you would rather be asking where the Fermi level is in relation to the band gap. In the case of vacuum level the question really is how big your surface potential (more specifically the electron affinity) is.

A way to answer both of these questions is to use XPS/UPS measurements, preferably under in situ conditions.