Over the last 20 years, the Institute of Structural Concrete at RWTH Aachen University has conducted numerous punching tests on interior slab-column connections with different types of punching shear reinforcement. Within the tests, different types and arrangements of stirrups, lattice girders, and double-headed studs were used as punching shear reinforcement. This paper summarizes the results of 39 punching tests and compares the punching shear resistances obtained from the tests with the punching shear capacity of flat slabs without punching shear reinforcement according to ACI 318-14 and Eurocode 2 along with the German Annex. Keywords: code comparison; flat slabs; punching shear; punching shear reinforcement; punching shear systems; punching tests.