diff --git a/SRC/Private/InterfaceMap.cs b/SRC/Private/InterfaceMap.cs
new file mode 100644
index 0000000..d8ce957
--- /dev/null
+++ b/SRC/Private/InterfaceMap.cs
@@ -0,0 +1,41 @@
+/********************************************************************************
+* InterfaceMap.cs                                                               *
+*                                                                               *
+* Author: Denes Solti                                                           *
+********************************************************************************/
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace Solti.Utils.Proxy.Internals
+{
+    /// <summary>
+    /// Cached interface mappings. Intended for private use only.
+    /// </summary>
+    public static class InterfaceMap<TInterface, TImplementation>
+        where TInterface: class
+        where TImplementation: TInterface
+    {
+        private static IReadOnlyDictionary<MethodInfo, MethodInfo> GetMappings()
+        {
+            Dictionary<MethodInfo, MethodInfo> dict = new();
+
+            foreach (Type iface in typeof(TInterface).GetHierarchy())
+            {
+                InterfaceMapping mapping = typeof(TImplementation).GetInterfaceMap(iface);
+
+                for (int i = 0; i < mapping.InterfaceMethods.Length; i++)
+                {
+                    dict.Add(mapping.InterfaceMethods[i], mapping.TargetMethods[i]);
+                }
+            }
+
+            return dict;
+        }
+
+        /// <summary>
+        /// Returns the cached mappings.
+        /// </summary>
+        public static IReadOnlyDictionary<MethodInfo, MethodInfo> Mappings { get; } = GetMappings();
+    }
+}
diff --git a/SRC/PublicAPI/netstandard2.0/PublicAPI.Unshipped.txt b/SRC/PublicAPI/netstandard2.0/PublicAPI.Unshipped.txt
index 0ea77bf..f10ec57 100644
--- a/SRC/PublicAPI/netstandard2.0/PublicAPI.Unshipped.txt
+++ b/SRC/PublicAPI/netstandard2.0/PublicAPI.Unshipped.txt
@@ -2,4 +2,6 @@ Solti.Utils.Proxy.InterfaceInterceptor<TInterface, TTarget>
 Solti.Utils.Proxy.InterfaceInterceptor<TInterface, TTarget>.InterfaceInterceptor(TTarget? target) -> void
 Solti.Utils.Proxy.InterfaceInterceptor<TInterface, TTarget>.Proxy.set -> void
 Solti.Utils.Proxy.InterfaceInterceptor<TInterface, TTarget>.Target.get -> TTarget?
+Solti.Utils.Proxy.Internals.InterfaceMap<TInterface, TImplementation>
+static Solti.Utils.Proxy.Internals.InterfaceMap<TInterface, TImplementation>.Mappings.get -> System.Collections.Generic.IReadOnlyDictionary<System.Reflection.MethodInfo!, System.Reflection.MethodInfo!>!
 virtual Solti.Utils.Proxy.InterfaceInterceptor<TInterface, TTarget>.Invoke(Solti.Utils.Proxy.InvocationContext! context) -> object?
\ No newline at end of file
diff --git a/SRC/PublicAPI/netstandard2.1/PublicAPI.Unshipped.txt b/SRC/PublicAPI/netstandard2.1/PublicAPI.Unshipped.txt
index 0ea77bf..f10ec57 100644
--- a/SRC/PublicAPI/netstandard2.1/PublicAPI.Unshipped.txt
+++ b/SRC/PublicAPI/netstandard2.1/PublicAPI.Unshipped.txt
@@ -2,4 +2,6 @@ Solti.Utils.Proxy.InterfaceInterceptor<TInterface, TTarget>
 Solti.Utils.Proxy.InterfaceInterceptor<TInterface, TTarget>.InterfaceInterceptor(TTarget? target) -> void
 Solti.Utils.Proxy.InterfaceInterceptor<TInterface, TTarget>.Proxy.set -> void
 Solti.Utils.Proxy.InterfaceInterceptor<TInterface, TTarget>.Target.get -> TTarget?
+Solti.Utils.Proxy.Internals.InterfaceMap<TInterface, TImplementation>
+static Solti.Utils.Proxy.Internals.InterfaceMap<TInterface, TImplementation>.Mappings.get -> System.Collections.Generic.IReadOnlyDictionary<System.Reflection.MethodInfo!, System.Reflection.MethodInfo!>!
 virtual Solti.Utils.Proxy.InterfaceInterceptor<TInterface, TTarget>.Invoke(Solti.Utils.Proxy.InvocationContext! context) -> object?
\ No newline at end of file