diff --git a/source/libs/sgeobj/CMakeLists.txt b/source/libs/sgeobj/CMakeLists.txt
index 183757de1..20540a606 100644
--- a/source/libs/sgeobj/CMakeLists.txt
+++ b/source/libs/sgeobj/CMakeLists.txt
@@ -25,6 +25,7 @@ set(LIBRARY_SOURCES
       cull_parse_util.cc
       ocs_binding_io.cc
       ocs_DataStore.cc
+      ocs_HostTopology.cc
       ocs_Session.cc
       parse.cc
       sge_ack.cc
diff --git a/source/libs/sgeobj/ocs_HostTopology.cc b/source/libs/sgeobj/ocs_HostTopology.cc
new file mode 100644
index 000000000..373d997aa
--- /dev/null
+++ b/source/libs/sgeobj/ocs_HostTopology.cc
@@ -0,0 +1,137 @@
+/*___INFO__MARK_BEGIN_NEW__*/
+/***************************************************************************
+ *
+ *  Copyright 2024 HPC-Gridware GmbH
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ***************************************************************************/
+/*___INFO__MARK_END_NEW__*/
+
+#include <ranges>
+#include <string>
+
+#include "ocs_HostTopology.h"
+
+ocs::HostTopology::HostTopology(std::string &topo_mask) : topo_mask(topo_mask) {
+   parseTopoMask(topo_mask);
+   numberTopoNodes(sockets);
+   sortNodes(sockets);
+}
+
+/** @brief Parses the topology mask and builds the topology tree.
+ *
+ * EBNF format of a well-formed topology mask:
+ *    topo_mask := socket_mask+
+ *    socket_mask := socket_char core_mask+
+ *    core_mask := core_char thread_mask+
+ *    thread_mask := thread_char
+ *    socket_char := 'S' | 's'
+ *    core_char := 'C' | 'c' | 'E' | 'e'
+ *    thread_char := 'T' | 't'
+ *
+ * @param topo_mask
+ */
+void
+ocs::HostTopology::parseTopoMask(std::string &topo_mask){
+   std::vector<Node> cores;
+   std::vector<Node> threads;
+
+   // We reverse the topo_mask to simplify the parsing!
+   for (char &it : std::ranges::reverse_view(topo_mask)) {
+      if (it == 'S' || it == 's') {
+         // put collected cores into a socket
+// 	std::reverse is not available at su0-0-lx-riscv64. Why?
+         //std::reverse(cores.begin(), cores.end());
+         Node socket(it, std::move(cores));
+         cores = std::vector<Node>();
+
+         // collect all sockets
+         this->sockets.push_back(std::move(socket));
+      } else if (it == 'C' || it == 'c' || it == 'E' || it == 'e') {
+         // put collected threads into a core
+         //std::reverse(threads.begin(), threads.end());
+         Node core(it, std::move(threads));
+         threads = std::vector<Node>();
+
+         // collect all cores
+         cores.push_back(std::move(core));
+      } else if (it == 'T' || it == 't') {
+         Node thread(it);
+
+         // collect all threads
+         threads.push_back(std::move(thread));
+      }
+   }
+   //std::reverse(sockets.begin(), sockets.end());
+
+   // We did not strictly parse the EBNF syntax of the topology mask. But need to ensure that it is really well-formed.
+   // Therefor, we compare the parsed topology mask with the original one.
+   if (topo_mask != getTopoMask()) {
+      throw std::runtime_error("Invalid topology mask");
+   }
+}
+
+void
+ocs::HostTopology::buildTopoMask(const Node& node, std::ostringstream& oss) const {
+   oss << node.c;
+   for (const auto& child : node.nodes) {
+      buildTopoMask(child, oss);
+   }
+}
+
+void
+ocs::HostTopology::buildFullTopoMask(const Node& node, std::ostringstream& oss) const {
+   oss << node.c << node.id;
+   for (const auto& child : node.nodes) {
+      buildFullTopoMask(child, oss);
+   }
+}
+
+std::string
+ocs::HostTopology::getTopoMask() const {
+   std::ostringstream oss;
+   for (const auto& socket : sockets) {
+      buildTopoMask(socket, oss);
+   }
+   return oss.str();
+}
+
+std::string
+ocs::HostTopology::getFullTopoMask() const {
+   std::ostringstream oss;
+   for (const auto& socket : sockets) {
+      buildFullTopoMask(socket, oss);
+   }
+   return oss.str();
+}
+
+void
+ocs::HostTopology::numberTopoNodes(std::vector<Node> &nodes) {
+   size_t id = 0;
+   for (auto &node : nodes) {
+      node.id = id++;
+      numberTopoNodes(node.nodes);
+   }
+}
+
+void
+ocs::HostTopology::sortNodes(std::vector<Node>& nodes) {
+   // also not available on su0-0-lx-riscv64 ?	
+   //std::sort(nodes.begin(), nodes.end(), [](const Node& a, const Node& b) {
+   //   return a.c < b.c;
+   //});
+   for (auto& node : nodes) {
+      sortNodes(node.nodes);
+   }
+}
diff --git a/source/libs/sgeobj/ocs_HostTopology.h b/source/libs/sgeobj/ocs_HostTopology.h
new file mode 100644
index 000000000..dbcdee8a1
--- /dev/null
+++ b/source/libs/sgeobj/ocs_HostTopology.h
@@ -0,0 +1,56 @@
+#pragma once
+
+/*___INFO__MARK_BEGIN_NEW__*/
+/***************************************************************************
+ *
+ *  Copyright 2024 HPC-Gridware GmbH
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ***************************************************************************/
+/*___INFO__MARK_END_NEW__*/
+
+#include <string>
+#include <sstream>
+#include <utility>
+#include <vector>
+
+namespace ocs {
+   class HostTopology {
+      class Node {
+      public:
+         char c;
+         size_t id;
+         std::vector<Node> nodes;
+
+         explicit Node(char c, std::vector<Node> nodes) : c(c), id(0), nodes(std::move(nodes)) {}
+         explicit Node(char c) : c(c), id(0), nodes() {}
+         ~Node() = default;
+      };
+
+      std::string topo_mask;
+      std::vector<Node> sockets;
+
+      void parseTopoMask(std::string &topo_mask);
+      void buildTopoMask(const Node& node, std::ostringstream& oss) const;
+      void buildFullTopoMask(const Node& node, std::ostringstream& oss) const;
+      void numberTopoNodes(std::vector<Node> &nodes);
+      void sortNodes(std::vector<Node>& nodes);
+
+   public:
+      HostTopology(std::string &topo_mask);
+
+      std::string getTopoMask() const;
+      std::string getFullTopoMask() const;
+   };
+}
diff --git a/test/libs/sgeobj/CMakeLists.txt b/test/libs/sgeobj/CMakeLists.txt
index ea1754261..c66cbc501 100644
--- a/test/libs/sgeobj/CMakeLists.txt
+++ b/test/libs/sgeobj/CMakeLists.txt
@@ -40,6 +40,11 @@ target_include_directories(test_sgeobj_fgl PRIVATE "./")
 target_link_libraries(test_sgeobj_fgl PRIVATE sgeobj cull commlists uti ${SGE_LIBS})
 add_test(NAME test_sgeobj_fgl COMMAND test_sgeobj_fgl)
 
+add_executable(test_sgeobj_HostTopology test_sgeobj_HostTopology.cc)
+target_include_directories(test_sgeobj_HostTopology PRIVATE "./")
+target_link_libraries(test_sgeobj_HostTopology PRIVATE sched gdi sgeobj gdi cull comm uti commlists ${SGE_LIBS})
+add_test(NAME test_sgeobj_HostTopology COMMAND test_sgeobj_HostTopology)
+
 add_executable(test_sgeobj_object test_sgeobj_object.cc)
 target_include_directories(test_sgeobj_object PRIVATE "./")
 target_link_libraries(test_sgeobj_object PRIVATE sgeobj cull comm uti commlists ${SGE_LIBS})
@@ -75,6 +80,7 @@ if (INSTALL_SGE_TEST)
    install(TARGETS test_sgeobj_performance DESTINATION testbin/${SGE_ARCH})
    install(TARGETS test_sgeobj_attr DESTINATION testbin/${SGE_ARCH})
    install(TARGETS test_sgeobj_fgl DESTINATION testbin/${SGE_ARCH})
+   install(TARGETS test_sgeobj_HostTopology DESTINATION testbin/${SGE_ARCH})
    install(TARGETS test_sgeobj_object DESTINATION testbin/${SGE_ARCH})
    install(TARGETS test_sgeobj_range DESTINATION testbin/${SGE_ARCH})
    install(TARGETS test_sgeobj_resource_quota DESTINATION testbin/${SGE_ARCH})
diff --git a/test/libs/sgeobj/test_sgeobj_HostTopology.cc b/test/libs/sgeobj/test_sgeobj_HostTopology.cc
new file mode 100644
index 000000000..4730d90e9
--- /dev/null
+++ b/test/libs/sgeobj/test_sgeobj_HostTopology.cc
@@ -0,0 +1,33 @@
+/*___INFO__MARK_BEGIN_NEW__*/
+/***************************************************************************
+ *
+ *  Copyright 2024 HPC-Gridware GmbH
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ***************************************************************************/
+/*___INFO__MARK_END_NEW__*/
+
+#include <iostream>
+
+#include "sgeobj/ocs_HostTopology.h"
+
+int main (int argc, char *argv[]) {
+   std::string topo_mask = "ScTTCtTsctTtt";
+   ocs::HostTopology ht = ocs::HostTopology(topo_mask);
+
+   std::cout << topo_mask << std::endl;
+   std::cout << ht.getTopoMask() << std::endl;
+   std::cout << ht.getFullTopoMask() << std::endl;
+   return 0;
+}
\ No newline at end of file