diff --git a/neocore/UInt160.py b/neocore/UInt160.py
index a0db42e..352fc84 100644
--- a/neocore/UInt160.py
+++ b/neocore/UInt160.py
@@ -4,3 +4,13 @@
 class UInt160(UIntBase):
     def __init__(self, data=None):
         super(UInt160, self).__init__(num_bytes=20, data=data)
+
+    @staticmethod
+    def ParseString(value):
+        if value[0:2] == '0x':
+            value = value[2:]
+        if not len(value) == 40:
+            raise Exception("Invalid UInt160 Format: %s chars != 40 chars" % len(value))
+        reversed_data = bytearray.fromhex(value)
+        reversed_data.reverse()
+        return UInt160(data=reversed_data)
diff --git a/neocore/UInt256.py b/neocore/UInt256.py
index f0f32d2..5ba634d 100644
--- a/neocore/UInt256.py
+++ b/neocore/UInt256.py
@@ -4,3 +4,13 @@
 class UInt256(UIntBase):
     def __init__(self, data=None):
         super(UInt256, self).__init__(num_bytes=32, data=data)
+
+    @staticmethod
+    def ParseString(value):
+        if value[0:2] == '0x':
+            value = value[2:]
+        if not len(value) == 64:
+            raise Exception("Invalid UInt256 Format: %s chars != 64 chars" % len(value))
+        reversed_data = bytearray.fromhex(value)
+        reversed_data.reverse()
+        return UInt256(data=reversed_data)
diff --git a/tests/test_numbers.py b/tests/test_numbers.py
index 569df5b..b4d6ba4 100644
--- a/tests/test_numbers.py
+++ b/tests/test_numbers.py
@@ -449,6 +449,23 @@ def test_initialization_invalid_length(self):
             u1 = UInt160(b'12345')
 
 
+    def test_parse(self):
+        string = '0xd7678dd97c000be3f33e9362e673101bac4ca654'
+        uint160 = UInt160.ParseString(string)
+        self.assertIsInstance(uint160, UInt160)
+        self.assertEqual(uint160.To0xString(), string)
+
+        string = '5b7074e873973a6ed3708862f219a6fbf4d1c411'
+        uint160 = UInt160.ParseString(string)
+        self.assertIsInstance(uint160, UInt160)
+        self.assertEqual(uint160.ToString(), string)
+
+        string = '5b7074e873973a6ed3708862f219a6fbf4d1c41'
+        with self.assertRaises(Exception) as context:
+            uint160 = UInt160.ParseString(string)
+
+
+
 class UInt256TestCase(TestCase):
     def test_initialization(self):
         u0 = UInt256()
@@ -463,3 +480,20 @@ def test_initialization_invalid(self):
 
         with self.assertRaises(Exception):
             u1 = UInt256('12345678901234567890123456789012')
+
+
+    def test_parse(self):
+        string = '0xcedb5c4e24b1f6fc5b239f2d1049c3229ad5ed05293c696b3740dc236c3f41b4'
+        uint256 = UInt256.ParseString(string)
+        self.assertIsInstance(uint256, UInt256)
+        self.assertEqual(uint256.To0xString(), string)
+
+        string = '9410bd44beb7d6febc9278b028158af2781fcfb40cf2c6067b3525d24eff19f6'
+        uint256 = UInt256.ParseString(string)
+        self.assertIsInstance(uint256, UInt256)
+        self.assertEqual(uint256.ToString(), string)
+
+        string = '9410bd44beb7d6febc9278b028158af2781fcfb40cf2c6067b3525d24eff19f'
+        with self.assertRaises(Exception) as context:
+            uint256 = UInt256.ParseString(string)
+