diff --git a/src/revpi_middleware/ios1/interface_ios.py b/src/revpi_middleware/ios1/interface_ios.py
index a02d2ab..8711ec5 100644
--- a/src/revpi_middleware/ios1/interface_ios.py
+++ b/src/revpi_middleware/ios1/interface_ios.py
@@ -140,6 +140,8 @@ class InterfaceInpInt(DbusInterfaceIo):
             <property name="byteorder" type="s" access="readwrite"/>
             <property name="defaultvalue" type="i" access="read"/>
             <property name="length" type="i" access="read"/>
+            <property name="min_value" type="i" access="read"/>
+            <property name="max_value" type="i" access="read"/>
             <property name="name" type="s" access="read"/>
             <property name="signed" type="b" access="readwrite"/>
             <property name="value" type="i" access="read"/>
@@ -158,6 +160,19 @@ class InterfaceInpInt(DbusInterfaceIo):
     def byteorder(self, value: str) -> None:
         self.io.byteorder = value
 
+    @property
+    def min_value(self) -> int:
+        if self.io.signed:
+            return -(1 << (self.io.length * 8 - 1))
+        return 0
+
+    @property
+    def max_value(self) -> int:
+        bit_length = self.io.length * 8
+        if self.io.signed:
+            return (1 << (bit_length - 1)) - 1
+        return (1 << bit_length) - 1
+
     @property
     def signed(self) -> bool:
         return self.io.signed
@@ -180,6 +195,8 @@ class InterfaceOutInt(InterfaceInpInt):
             <property name="byteorder" type="s" access="readwrite"/>
             <property name="defaultvalue" type="i" access="read"/>
             <property name="length" type="i" access="read"/>
+            <property name="min_value" type="i" access="read"/>
+            <property name="max_value" type="i" access="read"/>
             <property name="name" type="s" access="read"/>
             <property name="signed" type="b" access="readwrite"/>
             <property name="value" type="i" access="readwrite"/>