diff --git a/modules/io/pymod/export_omf_io.cc b/modules/io/pymod/export_omf_io.cc
index 1c52809be6271890cefea06d2d0e7d9ace5c94f7..cfb1977a819ca9d82c1b305cd0a86cc639440cae 100644
--- a/modules/io/pymod/export_omf_io.cc
+++ b/modules/io/pymod/export_omf_io.cc
@@ -67,6 +67,10 @@ namespace{
     return boost::python::make_tuple(VecToList(rnums), pos);
   }
 
+  boost::python::list wrap_get_rnums(OMFPtr omf, const String& cname) {
+    const std::vector<int>& rnums = omf->GetRNums(cname);
+    return VecToList<int>(rnums);
+  }
 }
 
 void export_omf_io() {
@@ -97,6 +101,7 @@ void export_omf_io() {
     .def("GetAvgBFactors", &OMF::GetAvgBFactors,(arg("cname")))
     .def("GetOccupancies", &OMF::GetOccupancies, return_value_policy<reference_existing_object>(),(arg("cname")))
     .def("GetSequence", &OMF::GetSequence, (arg("cname")))
+    .def("GetRNums", &wrap_get_rnums, (arg("cname")))
     .def("ToAssembly", &wrap_to_assembly, (arg("bu_info")))
     .def("Trace", &wrap_trace, (arg("cname"), arg("aname")))
   ;
diff --git a/modules/io/src/mol/omf.cc b/modules/io/src/mol/omf.cc
index b4fd31c8619cf47397778110a3120aaa4f784293..a00acc67eb04e25e023fd2f95f33442e87226ef2 100644
--- a/modules/io/src/mol/omf.cc
+++ b/modules/io/src/mol/omf.cc
@@ -5677,4 +5677,12 @@ String OMF::GetSequence(const String& cname) const {
   return sequence;
 }
 
+const std::vector<int>& OMF::GetRNums(const String& cname) const {
+  auto it = chain_data_.find(cname);
+  if(it == chain_data_.end()) {
+    throw ost::Error("Provided chain name not in OMF structure");
+  }
+  return it->second->rnums;
+}
+
 }} //ns
diff --git a/modules/io/src/mol/omf.hh b/modules/io/src/mol/omf.hh
index ce0850e3774988e1e9694c171877bee369921322..2fd9c05952f8045cf849e10860e809eb3b0dee10 100644
--- a/modules/io/src/mol/omf.hh
+++ b/modules/io/src/mol/omf.hh
@@ -242,6 +242,8 @@ public:
 
   String GetSequence(const String& cname) const;
 
+  const std::vector<int>& GetRNums(const String& cname) const;
+
   // raw data access - pros only...
   const std::vector<ResidueDefinition>& GetResidueDefinitions() const {
     return residue_definitions_;