Enables ephrin receptor activity and protein domain specific binding activity. Involved in several processes, including cell development; embryonic morphogenesis; and regulation of axon guidance. Located in axon and plasma membrane. Expressed in several structures, including hypodermal cell; neuroblasts; neurons; oocyte; and somatic nervous system. Human ortholog(s) of this gene implicated in several diseases, including Alzheimer's disease; aortic dissection; cataract 6 multiple types; and gastrointestinal system cancer (multiple). Is an ortholog of several human genes including EPHB1 (EPH receptor B1); EPHB2 (EPH receptor B2); and EPHB3 (EPH receptor B3).