diff --git a/monero/address.py b/monero/address.py
index 1e377ce..7b2dc92 100644
--- a/monero/address.py
+++ b/monero/address.py
@@ -4,6 +4,9 @@ from sha3 import keccak_256
 from . import base58
 
 class Address(object):
+    _valid_netbytes = (18, 53)
+    # NOTE: _valid_netbytes order is (real, testnet)
+
     def __init__(self, address):
         address = str(address)
         if len(address) != 95:
@@ -15,9 +18,13 @@ class Address(object):
         checksum = self._decoded[-4:]
         if checksum != keccak_256(self._decoded[:-4]).digest()[:4]:
             raise ValueError("Invalid checksum")
+        if self._decoded[0] not in self._valid_netbytes:
+            raise ValueError("Invalid address netbyte {nb}. Allowed values are: {allowed}".format(
+                nb=hexlify(bytes(self._decoded[0])),
+                allowed=", ".join(map(lambda b: '%02x' % b, self._valid_netbytes))))
 
     def is_testnet(self):
-        return self._decoded[0] in bytes([53, 54])
+        return self._decoded[0] == self._valid_netbytes[1]
 
     def get_view_key(self):
         return hexlify(self._decoded[33:65]).decode()
@@ -46,7 +53,16 @@ class Address(object):
         return super()
 
 
+class SubAddress(Address):
+    _valid_netbytes = (42, 63)
+
+    def with_payment_id(self):
+        raise TypeError("SubAddress cannot be merged with payment ID into IntegratedAddress")
+
+
 class IntegratedAddress(Address):
+    _valid_netbytes = (19, 54)
+
     def __init__(self, address):
         address = str(address)
         if len(address) != 106:
@@ -66,7 +82,16 @@ class IntegratedAddress(Address):
 def address(addr):
     addr = str(addr)
     if len(addr) == 95:
-        return Address(addr)
+        netbyte = unhexlify(base58.decode(addr))[0]
+        if netbyte in Address._valid_netbytes:
+            return Address(addr)
+        elif netbyte in SubAddress._valid_netbytes:
+            return SubAddress(addr)
+        raise ValueError("Invalid address netbyte {nb}. Allowed values are: {allowed}".format(
+            nb=hexlify(self._decoded[0]),
+            allowed=", ".join(map(
+                lambda b: '%02x' % b,
+                sorted(Address._valid_netbytes + SubAddress._valid_netbytes)))))
     elif len(addr) == 106:
         return IntegratedAddress(addr)
     raise ValueError("Address must be either 95 or 106 characters long")
diff --git a/monero/backends/jsonrpc.py b/monero/backends/jsonrpc.py
index c3502c1..80b0c50 100644
--- a/monero/backends/jsonrpc.py
+++ b/monero/backends/jsonrpc.py
@@ -7,7 +7,7 @@ import requests
 
 from .. import exceptions
 from ..account import Account
-from ..address import Address
+from ..address import address
 from ..numbers import from_atomic, to_atomic
 
 _log = logging.getLogger(__name__)
@@ -79,7 +79,7 @@ class JSONRPC(object):
         data = {
             'account_index': account,
             'destinations': list(map(
-                lambda dst: {'address': str(Address(dst[0])), 'amount': to_atomic(dst[1])},
+                lambda dst: {'address': str(address(dst[0])), 'amount': to_atomic(dst[1])},
                 destinations)),
             'mixin': mixin,
             'priority': priority,
diff --git a/tests/address.py b/tests/address.py
index 0fe7856..4103685 100644
--- a/tests/address.py
+++ b/tests/address.py
@@ -1,6 +1,6 @@
 import unittest
 
-from monero.address import Address, IntegratedAddress, address
+from monero.address import Address, SubAddress, IntegratedAddress, address
 
 class Tests(object):
     def test_from_and_to_string(self):
@@ -16,6 +16,9 @@ class Tests(object):
         self.assertEqual(ia.get_view_key(), self.pvk)
         self.assertEqual(ia.get_base_address(), a)
 
+        sa = SubAddress(self.subaddr)
+        self.assertEqual(str(sa), self.subaddr)
+
     def test_payment_id(self):
         a = Address(self.addr)
         ia = a.with_payment_id(self.pid)
@@ -43,6 +46,15 @@ class Tests(object):
         self.assertEqual(ia2.is_testnet(), self.testnet)
         self.assertEqual(ia2.get_base_address(), a)
 
+        sa = SubAddress(self.subaddr)
+        sa2 = address(self.subaddr)
+        self.assertIsInstance(sa2, SubAddress)
+        self.assertEqual(sa, sa2)
+        self.assertEqual(sa, self.subaddr)
+        self.assertEqual(self.subaddr, sa)
+        self.assertEqual(sa.is_testnet(), self.testnet)
+        self.assertEqual(sa2.is_testnet(), self.testnet)
+
     def test_idempotence(self):
         a = Address(self.addr)
         a_idem = Address(a)
@@ -60,19 +72,41 @@ class Tests(object):
         ia_idem = address(ia)
         self.assertEqual(ia, ia_idem)
 
+    def test_invalid(self):
+        self.assertRaises(ValueError, Address, self.addr_invalid)
+        self.assertRaises(ValueError, Address, self.iaddr_invalid)
+
+    def test_type_mismatch(self):
+        self.assertRaises(ValueError, Address, self.iaddr)
+        self.assertRaises(ValueError, Address, self.subaddr)
+        self.assertRaises(ValueError, IntegratedAddress, self.addr)
+        self.assertRaises(ValueError, IntegratedAddress, self.subaddr)
+        self.assertRaises(ValueError, SubAddress, self.addr)
+        self.assertRaises(ValueError, SubAddress, self.iaddr)
+
+    def test_subaddress_cannot_into_integrated(self):
+        sa = SubAddress(self.subaddr)
+        self.assertRaises(TypeError, sa.with_payment_id, self.pid)
+
 class AddressTestCase(unittest.TestCase, Tests):
     addr = '43aeKax1ts4BoEbSyzKVbbDRmc8nsnpZLUpQBYvhUxs3KVrodnaFaBEQMDp69u4VaiEG3LSQXA6M61mXPrztCLuh7PFUAmd'
     psk = '33a7ceb933b793408d49e82c0a34664a4be7117243cb77a64ef280b866d8aa6e'
     pvk = '96f70d63d9d3558b97a5dd200a170b4f45b3177a274aa90496ea683896ff6438'
     pid = '4a6f686e47616c74'
+    subaddr = '83bK2pMxCQXdRyd6W1haNWYRsF6Qb3iGa8gxKEynm9U7cYoXrMHFwRrFFuxRSgnLtGe7LM8SmrPY6L3TVBa3UV3YLuVJ7Rw'
     iaddr = '4DHKLPmWW8aBoEbSyzKVbbDRmc8nsnpZLUpQBYvhUxs3KVrodnaFaBEQMDp69u4VaiEG3LSQXA6M61mXPrztCLuhAR6GpL18QNwE8h3TuF'
     testnet = False
+    addr_invalid = '43aeKax1ts4boEbSyzKVbbDRmc8nsnpZLUpQBYvhUxs3KVrodnaFaBEQMDp69u4VaiEG3LSQXA6M61mXPrztCLuh7PFUAmd'
+    iaddr_invalid = '4DHKLpmWW8aBoEbSyzKVbbDRmc8nsnpZLUpQBYvhUxs3KVrodnaFaBEQMDp69u4VaiEG3LSQXA6M61mXPrztCLuhAR6GpL18QNwE8h3TuF'
 
 
 class TestnetAddressTestCase(AddressTestCase, Tests):
-    addr = '9u9j6xG1GNu4ghrdUL35m5PQcJV69YF8731DSTDoh7pDgkBWz2LWNzncq7M5s1ARjPRhvGPX4dBUeC3xNj4wzfrjV6SY3e9'
-    psk = '345b201b8d1ba216074e3c45ca606c85f68563f60d0b8c0bfab5123f80692aed'
-    pvk = '9deb70cc7e1e23d635de2d5a3086a293b4580dc2b9133b4211bc09f22fadc4f9'
+    addr = '9vgV48wWAPTWik5QSUSoGYicdvvsbSNHrT9Arsx1XBTz6VrWPSgfmnUKSPZDMyX4Ms8R9TkhB4uFqK9s5LUBbV6YQN2Q9ag'
+    psk = '5cbcfbcea7cc62b1aeb76758ad8df5f8cbe0c63d40c8cd9c49377bbc9c9b9520'
+    pvk = 'de048ca310ff7d6e3b6714bccdebd62c56d680a10272846c875241fa2c5fc1cf'
     pid = '4a6f686e47616c74'
-    iaddr = 'A4rQ7m5VseR4ghrdUL35m5PQcJV69YF8731DSTDoh7pDgkBWz2LWNzncq7M5s1ARjPRhvGPX4dBUeC3xNj4wzfrjihS6W83Km1mE7W3kMa'
+    iaddr = 'A6PA4wkzmeyWik5QSUSoGYicdvvsbSNHrT9Arsx1XBTz6VrWPSgfmnUKSPZDMyX4Ms8R9TkhB4uFqK9s5LUBbV6YbfyqvDecDn3E7cvp9b'
+    subaddr = 'BbBjyYoYNNwFfL8RRVRTMiZUofBLpjRxdNnd5E4LyGcAK5CEsnL3gmE5QkrDRta7RPficGHcFdR6rUwWcjnwZVvCE3tLxhJ'
     testnet = True
+    addr_invalid = '9vgV48wWAPTWik5QSUSoGYicdvvsbSNHrT9Arsx1XBTz6VrWPSgfmnUKSPZDMyX4Ms8R9TkhB4uFqK9s5LUbbV6YQN2Q9ag'
+    iaddr_invalid = 'A6PA4wkzmeyWik5qSUSoGYicdvvsbSNHrT9Arsx1XBTz6VrWPSgfmnUKSPZDMyX4Ms8R9TkhB4uFqK9s5LUBbV6YbfyqvDecDn3E7cvp9b'