diff --git a/nanoFramework.System.Net/IPAddress.cs b/nanoFramework.System.Net/IPAddress.cs
index e74e75c..c65df3d 100644
--- a/nanoFramework.System.Net/IPAddress.cs
+++ b/nanoFramework.System.Net/IPAddress.cs
@@ -6,6 +6,7 @@
 
 using System.Net.NetworkInformation;
 using System.Net.Sockets;
+using System.Runtime.CompilerServices;
 
 namespace System.Net
 {
@@ -133,38 +134,7 @@ public byte[] GetAddressBytes()
         /// </returns>
         public static IPAddress Parse(string ipString)
         {
-            if (ipString == null)
-                throw new ArgumentNullException();
-
-            ulong ipAddress = 0L;
-            int lastIndex = 0;
-            int shiftIndex = 0;
-            ulong mask = 0x00000000000000FF;
-            ulong octet = 0L;
-            int length = ipString.Length;
-
-            for (int i = 0; i < length; ++i)
-            {
-                // Parse to '.' or end of IP address
-                if (ipString[i] == '.' || i == length - 1)
-                    // If the IP starts with a '.'
-                    // or a segment is longer than 3 characters or shiftIndex > last bit position throw.
-                    if (i == 0 || i - lastIndex > 3 || shiftIndex > 24)
-                    {
-                        throw new ArgumentException();
-                    }
-                    else
-                    {
-                        i = i == length - 1 ? ++i : i;
-                        octet = ulong.Parse(ipString.Substring(lastIndex, i - lastIndex)) & 0x00000000000000FF;
-                        ipAddress = ipAddress + ((octet << shiftIndex) & mask);
-                        lastIndex = i + 1;
-                        shiftIndex = shiftIndex + 8;
-                        mask = (mask << 8);
-                    }
-            }
-
-            return new IPAddress((long)ipAddress);
+            return new IPAddress(NetworkInterface.IPAddressFromString(ipString));
         }
 
         /// <summary>
@@ -179,13 +149,7 @@ public static IPAddress Parse(string ipString)
         /// </remarks>
         public override string ToString()
         {
-            return ((byte)(Address)).ToString() +
-                    "." +
-                    ((byte)(Address >> 8)).ToString() +
-                    "." +
-                    ((byte)(Address >> 16)).ToString() +
-                    "." +
-                    ((byte)(Address >> 24)).ToString();
+            return IPv4ToString((uint)Address);
         }
 
         /// <summary>
@@ -230,5 +194,12 @@ internal IPAddress Snapshot()
 
             throw new NotSupportedException();
         }
+
+        #region native methods
+
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        internal static extern string IPv4ToString(uint ipv4Address);
+
+        #endregion
     }
 }
diff --git a/nanoFramework.System.Net/NetworkInformation/NetworkInterface.cs b/nanoFramework.System.Net/NetworkInformation/NetworkInterface.cs
index df292e8..46be569 100644
--- a/nanoFramework.System.Net/NetworkInformation/NetworkInterface.cs
+++ b/nanoFramework.System.Net/NetworkInformation/NetworkInterface.cs
@@ -96,19 +96,6 @@ public static NetworkInterface[] GetAllNetworkInterfaces()
             return ifaces;
         }
 
-        private string IPv4AddressToString(uint ipv4Address)
-        {
-            return string.Concat(
-                            ((ipv4Address >> 0) & 0xFF).ToString(),
-                                ".",
-                            ((ipv4Address >> 8) & 0xFF).ToString(),
-                                ".",
-                            ((ipv4Address >> 16) & 0xFF).ToString(),
-                                ".",
-                            ((ipv4Address >> 24) & 0xFF).ToString()
-                            );
-        }
-
         private string IPv6AddressToString(uint[] ipv6Address)
         {
             throw new NotImplementedException();
@@ -134,9 +121,9 @@ public void EnableStaticIPv4(string ipv4Address, string ipv4SubnetMask, string i
         {
             try
             {
-                _ipv4Address = IPAddressFromString(ipv4Address);
-                _ipv4NetMask = IPAddressFromString(ipv4SubnetMask);
-                _ipv4GatewayAddress = IPAddressFromString(ipv4GatewayAddress);
+                _ipv4Address = (uint)IPAddressFromString(ipv4Address);
+                _ipv4NetMask = (uint)IPAddressFromString(ipv4SubnetMask);
+                _ipv4GatewayAddress = (uint)IPAddressFromString(ipv4GatewayAddress);
                 _startupAddressMode = AddressMode.Static;
 
                 UpdateConfiguration((int)UpdateOperation.Dhcp);
@@ -190,9 +177,9 @@ public void EnableStaticIP(string ipv4Address, string ipv4subnetMask, string ipv
             {
                 throw new NotImplementedException();
 
-                _ipv4Address = IPAddressFromString(ipv4Address);
-                _ipv4NetMask = IPAddressFromString(ipv4subnetMask);
-                _ipv4GatewayAddress = IPAddressFromString(ipv4gatewayAddress);
+                _ipv4Address = (uint)IPAddressFromString(ipv4Address);
+                _ipv4NetMask = (uint)IPAddressFromString(ipv4subnetMask);
+                _ipv4GatewayAddress = (uint)IPAddressFromString(ipv4gatewayAddress);
 
                 // FIXME
                 // need to test this
@@ -242,7 +229,7 @@ public void EnableStaticIPv4Dns(string[] dnsAddresses)
             int iAddress = 0;
             for (int i = 0; i < dnsAddresses.Length; i++)
             {
-                uint address = IPAddressFromString(dnsAddresses[i]);
+                uint address = (uint)IPAddressFromString(dnsAddresses[i]);
 
                 addresses[iAddress] = address;
 
@@ -351,7 +338,7 @@ public bool IsAutomaticDnsEnabled
         /// </summary>
         public string IPv4Address
         {
-            get { return IPv4AddressToString(_ipv4Address); }
+            get { return IPAddress.IPv4ToString(_ipv4Address); }
         }
 
         /// <summary>
@@ -359,7 +346,7 @@ public string IPv4Address
         /// </summary>
         public string IPv4GatewayAddress
         {
-            get { return IPv4AddressToString(_ipv4GatewayAddress); }
+            get { return IPAddress.IPv4ToString(_ipv4GatewayAddress); }
         }
 
         /// <summary>
@@ -367,7 +354,7 @@ public string IPv4GatewayAddress
         /// </summary>
         public string IPv4SubnetMask
         {
-            get { return IPv4AddressToString(_ipv4NetMask); }
+            get { return IPAddress.IPv4ToString(_ipv4NetMask); }
         }
 
         /// <summary>
@@ -390,12 +377,12 @@ public string[] IPv4DnsAddresses
 
                 if (_ipv4dnsAddress1 != 0)
                 {
-                    list.Add(IPv4AddressToString(_ipv4dnsAddress1));
+                    list.Add(IPAddress.IPv4ToString(_ipv4dnsAddress1));
                 }
 
                 if (_ipv4dnsAddress2 != 0)
                 {
-                    list.Add(IPv4AddressToString(_ipv4dnsAddress2));
+                    list.Add(IPAddress.IPv4ToString(_ipv4dnsAddress2));
                 }
 
                 return (string[])list.ToArray(typeof(string));
@@ -489,7 +476,7 @@ public NetworkInterfaceType NetworkInterfaceType
         private extern void UpdateConfiguration(int updateType);
 
         [MethodImpl(MethodImplOptions.InternalCall)]
-        private static extern uint IPAddressFromString(string ipAddress);
+        internal static extern long IPAddressFromString(string ipAddress);
 
         #endregion
     }
diff --git a/nanoFramework.System.Net/Properties/AssemblyInfo.cs b/nanoFramework.System.Net/Properties/AssemblyInfo.cs
index 6215019..a5c758d 100644
--- a/nanoFramework.System.Net/Properties/AssemblyInfo.cs
+++ b/nanoFramework.System.Net/Properties/AssemblyInfo.cs
@@ -12,7 +12,7 @@
 
 ////////////////////////////////////////////////////////////////
 // update this whenever the native assembly signature changes //
-[assembly: AssemblyNativeVersion("100.1.3.2")]
+[assembly: AssemblyNativeVersion("100.1.3.3")]
 ////////////////////////////////////////////////////////////////
 
 // Setting ComVisible to false makes the types in this assembly not visible