diff --git a/xknxproject/loader/application_program_loader.py b/xknxproject/loader/application_program_loader.py
index bedfb2a..eec1b18 100644
--- a/xknxproject/loader/application_program_loader.py
+++ b/xknxproject/loader/application_program_loader.py
@@ -58,7 +58,7 @@ def load(
             tree_iterator = ElementTree.iterparse(application_xml, events=("start",))
             # get namespace from root element
             _, elem = next(tree_iterator)
-            namespace = elem.tag.split("KNX")[0]
+            namespace = elem.tag.split("KNX", maxsplit=1)[0]
             # define namespaced tag strings for faster comparison - ~15% faster
             # than elem.tag.endswith("tagname") or elem.tag == f"{namespace}tagname"
             ns_com_object = f"{namespace}ComObject"
diff --git a/xknxproject/loader/project_loader.py b/xknxproject/loader/project_loader.py
index a5eec4a..f4f69bd 100644
--- a/xknxproject/loader/project_loader.py
+++ b/xknxproject/loader/project_loader.py
@@ -322,7 +322,9 @@ def __get_links_from_ets4(com_object: ElementTree.Element) -> list[str]:
         ga_list = connectors.findall("{*}Send") + connectors.findall("{*}Receive")
 
         # Remove the project ID from GA
-        return [ga.get("GroupAddressRefId", "").split("_")[1] for ga in ga_list]
+        return [
+            ga.get("GroupAddressRefId", "").split("_", maxsplit=1)[1] for ga in ga_list
+        ]
 
     @staticmethod
     def __get_links_from_ets5(com_object: ElementTree.Element) -> list[str]:
@@ -451,7 +453,7 @@ def parse_space(
 
     def parse_functions(self, node: ElementTree.Element) -> XMLFunction:
         """Parse a functions from the document."""
-        identifier = node.get("Id", "").split("_")[1]
+        identifier = node.get("Id", "").split("_", 1)[1]
         project_uid = node.get("Puid")
         function_type = node.get("Type", "")
 
@@ -468,7 +470,7 @@ def parse_functions(self, node: ElementTree.Element) -> XMLFunction:
         for sub_node in node:
             if sub_node.tag.endswith("GroupAddressRef"):
                 project_uid = sub_node.get("Puid")
-                ref_id = sub_node.get("RefId", "").split("_")[1]
+                ref_id = sub_node.get("RefId", "").split("_", 1)[1]
 
                 group_address_ref: XMLGroupAddressRef = XMLGroupAddressRef(
                     ref_id=ref_id,
diff --git a/xknxproject/models/models.py b/xknxproject/models/models.py
index 1c33977..af0718b 100644
--- a/xknxproject/models/models.py
+++ b/xknxproject/models/models.py
@@ -35,7 +35,7 @@ def __init__(
     ):
         """Initialize a group address."""
         self.name = name
-        self.identifier = identifier.split("_")[1]
+        self.identifier = identifier.split("_", 1)[1]
         self.raw_address = int(address)
         self.project_uid = project_uid
         self.description = description
@@ -284,7 +284,7 @@ def resolve_channel_module_placeholders(
         ):
             return
 
-        module_instance_ref = self.ref_id.split("_CH")[0]
+        module_instance_ref = self.ref_id.split("_CH", maxsplit=1)[0]
         try:
             module_instance = next(
                 mi
@@ -316,10 +316,10 @@ class ModuleInstance:
 
     def __post_init__(self) -> None:
         """Set is_submodule based on the identifier."""
-        self.module_def_id = self.ref_id.split("_")[0]
+        self.module_def_id = self.ref_id.split("_", maxsplit=1)[0]
         _submodule_match = re.search(r"(_SM-[^_]+)", self.identifier)
         if _submodule_match is not None:
-            self.base_module = f"{self.identifier.split('_SM-')[0]}"
+            self.base_module = f"{self.identifier.split('_SM-', maxsplit=1)[0]}"
             self.definition_id = f"{self.module_def_id}{_submodule_match.group()}"
         else:
             self.base_module = None
@@ -580,7 +580,9 @@ def _base_number_from_allocator(
                 base_number_argument,
             )
             return 0
-        module_instance_index = int(self.ref_id.split("_MI-")[1].split("_")[0])
+        module_instance_index = int(
+            self.ref_id.split("_MI-", maxsplit=1)[1].split("_", maxsplit=1)[0]
+        )
         return allocator_object_base.start + (
             allocator_size * (module_instance_index - 1)
         )
diff --git a/xknxproject/util.py b/xknxproject/util.py
index 934921a..1ae974b 100644
--- a/xknxproject/util.py
+++ b/xknxproject/util.py
@@ -142,8 +142,8 @@ def text_parameter_insert_module_instance(
     if "_MD-" in text_parameter_ref_id and (
         _module_ref := get_module_instance_part(instance_ref, next_id=instance_next_id)
     ):
-        _application_ref = text_parameter_ref_id.split("_MD-")[0]
-        _parameter_ref = text_parameter_ref_id.split("_P-")[1]
+        _application_ref = text_parameter_ref_id.split("_MD-", maxsplit=1)[0]
+        _parameter_ref = text_parameter_ref_id.rsplit("_P-", maxsplit=1)[-1]
         return f"{_application_ref}_{_module_ref}_P-{_parameter_ref}"
 
     return text_parameter_ref_id
diff --git a/xknxproject/zip/extractor.py b/xknxproject/zip/extractor.py
index 3978f64..59f5006 100644
--- a/xknxproject/zip/extractor.py
+++ b/xknxproject/zip/extractor.py
@@ -169,7 +169,7 @@ def _get_xml_namespace(project_zip: ZipFile) -> str:
 def _get_schema_version(namespace: str) -> int:
     """Get the schema version of the project."""
     try:
-        schema_version = int(namespace.split("/")[-1])
+        schema_version = int(namespace.rsplit("/", 1)[-1])
     except ValueError:
         _LOGGER.error("Could not parse schema version from %s", namespace)
         raise UnexpectedFileContent("Could not parse schema version.") from None