Iran Ballistic Missiles and International Sanctions Enforcement Act This bill states that it is U.S. policy to prevent Iran from undertaking any activity related to nuclear-capable ballistic missiles. The President shall report to Congress regarding the foreign and domestic supply chain in Iran that supports Iran's ballistic missile program. The report shall identify individuals and companies involved in such activities. The President shall submit to Congress a determination of whether any Iranian ballistic missile test violates United Nations Security Council Resolution 2231. Such resolution endorses the Joint Comprehensive Plan of Action and sets out a mechanism to monitor Iranian compliance. The President shall impose sanctions against: (1) Iranian government agencies involved in ballistic missile development; (2) foreign entities that supply material for, or otherwise facilitate or finance, such efforts; (3) foreign persons or foreign government agencies that import, export, or re-export prohibited arms or related material to or from Iran; and (4) foreign persons or entities that transfer goods or technologies contributing to Iran's ability to acquire or develop ballistic missiles, including launch technology, and destabilizing numbers and types of advanced conventional weapons. The President shall investigate potential violations of ballistic missile and conventional weapons sanctions against Iran. The President shall report to Congress regarding credible information about Iran's violations of arms restrictions and attempts to pursue sanctionable activities.