regions.

Recently, we developed a procedure to identify blazars using their infrared (IR) colors within the preliminary data release of the Wide-field Infrared Survey Explorer ([[*WISE*]{}]{}) survey [@wright10] [^2]. In particular, we discovered that the IR color space distribution of the extragalactic sources dominated by non-thermal emission, as blazars, can be used to distinguish such sources from other classes of galaxies and/or AGNs and/or galactic sources [@massaro11b hereinafter Paper I]. We also found that $\gamma$-ray emitting blazar delineate a narrow, distinct region of the IR color-color plots, denominated as the [[*WISE*]{}]{} Gamma-ray blazar Strip ([[*WGS*]{}]{}) [@dabrusco12 hereinafter Paper II]. There is a peculiar correspondence between the IR and $\gamma$-ray spectral properties of the blazars detected in the 2FGL (Paper II). Then, on the basis of our previous investigation of these IR-$\gamma$-ray properties of blazars, we built a parametrization of the [[*WGS*]{}]{} to evaluate how many AGNs of Uncertain type (AGUs) have a counterpart associated with a $\gamma$-ray blazar candidate in the 2FGL [@massaro12a hereinafter Paper III].

In this paper, we present a new association method based on the IR colors of the $\gamma$-ray emitting blazars and the [[*WGS*]{}]{} parametrization. Then we apply this new association procedure to search for $\gamma$-ray 