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The stannides  RE Ir 2 Sn 4  ( RE =La, Ce, Pr, Nd, Sm) were synthesized from the elements by arc melting or by induction melting in sealed niobium containers. They crystallize with the NdRh 2 Sn 4  type structure, space group  Pnma . The samples were characterized by powder X-ray diffraction (Guinier technique). Three structures were refined from single-crystal X-ray data:  a =1844.5(2),  b =450.33(4),  c =716.90(6) pm,  wR 2=0.0323, 1172  F  2  values, 44 variables for LaIr 2 Sn 4 ,  a =1840.08(2),  b =448.24(4),  c =719.6(1) pm,  wR 2=0.0215, 1265  F  2  values, 45 variables for Ce 1.13 Ir 2 Sn 3.87 , and  a =1880.7(1),  b =446.2(1),  c =733.0(1) pm,  wR 2=0.0845, 836  F  2  values, 45 variables for Ce 1.68 Ir 2 Sn 3.32 . The structures consist of three-dimensional [Ir 2 Sn 4 ] polyanionic networks in which the rare earth atoms fill pentagonal prismatic channels. The striking structural motif concerns the formation of solid solutions  RE  1+   x  Ir 2 Sn 4−   x   on the Sn4 sites, which have similar coordination as the  RE  sites. Temperature dependent magnetic susceptibility measurements revealed diamagnetic behavior for LaIr 2 Sn 4 . CeIr 2 Sn 4 , PrIr 2 Sn 4  and NdIr 2 Sn 4  show Curie-Weiss paramagnetism while SmIr 2 Sn 4  exhibits typical van Vleck paramagnetism. Antiferromagnetic ground states were observed for CeIr 2 Sn 4  ( T  N =3.3 K) and SmIr 2 Sn 4  ( T  N =3.8 K).  119 Sn Mössbauer spectra show a close superposition of four sub-spectra which can be distinguished through their isomer shift and the quadrupole splitting parameter.