Receptor for interleukin-11. The receptor systems for IL6, LIF, OSM, CNTF, IL11 and CT1 can utilize IL6ST for initiating signal transmission. The IL11/IL11RA/IL6ST complex may be involved in the control of proliferation and/or differentiation of skeletogenic progenitor or other mesenchymal cells. On ligand binding, forms a multimer complex with IL6ST/gp130. Expression restricted to testis, lymph node and thymus. Highest level in testis. Il11ra2 appears to arise through gene duplication of ancestral origin and has been lost in some inbred mouse strains. Belongs to the type I cytokine receptor family. Type 3 subfamily.