These websites will be helpful as you identify your unknowns. Your unknown will be among the list of possible unknowns. You may also find it helpful to compare your IR spectrum with those found at the Spectral Database of Organic Compounds, and additional information may also be found at the National Institute of Science and Technology Chemistry Webbook.

Also, try the new Searchable Unknowns Database. The unknowns are listed by as many functional groups as possible, you can search for more than one functional group in a molecule, and there are fewer unknowns!