diff --git a/noipy/__init__.py b/noipy/__init__.py
index b53e976..d60a092 100644
--- a/noipy/__init__.py
+++ b/noipy/__init__.py
@@ -9,7 +9,7 @@
 """
 
 __title__ = "noipy"
-__version_info__ = ('1', '5', '3')
+__version_info__ = ('1', '5', '4')
 __version__ = ".".join(__version_info__)
 __author__ = "Pablo O Vieira"
 __email__ = "noipy@pv8.io"
diff --git a/noipy/utils.py b/noipy/utils.py
index 355f7ce..2ae9ef9 100644
--- a/noipy/utils.py
+++ b/noipy/utils.py
@@ -5,12 +5,23 @@
 # Copyright (c) 2013 Pablo O Vieira (povieira)
 # See README.rst and LICENSE for details.
 
+try:
+    from StringIO import StringIO
+except ImportError:
+    from io import StringIO
+
 import socket
 
+import dns.resolver
 import requests
 
 HTTPBIN_URL = "https://httpbin.org/ip"
 
+IP4ONLY_URL = "http://ip4only.me/api"
+IP6ONLY_URL = "http://ip6only.me/api"
+
+COMMON_DNS = "8.8.8.8"
+
 try:
     input = raw_input
 except NameError:
@@ -22,19 +33,57 @@ def read_input(message):
 
 
 def get_ip():
-    """Return machine's origin IP address.
+    """Return machine's origin IP address(es).
     """
+    lst = []
+    try:
+        r = requests.get(IP4ONLY_URL)
+        if r.status_code == 200:
+            lst.append(r.text.split(',')[1])
+    except requests.exceptions.ConnectionError:
+        pass
     try:
-        r = requests.get(HTTPBIN_URL)
-        return r.json()['origin'] if r.status_code == 200 else None
+        r = requests.get(IP6ONLY_URL)
+        if r.status_code == 200:
+            lst.append(r.text.split(',')[1])
     except requests.exceptions.ConnectionError:
+        pass
+    if not lst:
+        try:
+            r = requests.get(HTTPBIN_URL)
+            if r.status_code == 200:
+                lst.append(r.json()['origin'])
+        except requests.exceptions.ConnectionError:
+            pass
+    if not lst:
         return None
+    return ','.join(lst)
 
 
 def get_dns_ip(dnsname):
-    """Return machine's current IP address in DNS.
+    """Return machine's current IP address(es) in DNS.
     """
+    resolver = dns.resolver.Resolver(StringIO("nameserver %s" % COMMON_DNS))
+
+    try:
+        resolve = resolver.resolve
+    except AttributeError:
+        resolve = resolver.query
+
+    lst = []
+    try:
+        lst += [a.address for a in resolve(dnsname, 'A')]
+    except dns.exception.DNSException:
+        pass
     try:
-        return socket.gethostbyname(dnsname)
-    except socket.error:
+        lst += [a.address for a in resolve(dnsname, 'AAAA')]
+    except dns.exception.DNSException:
+        pass
+    if not lst:
+        try:
+            lst.append(socket.gethostbyname(dnsname))
+        except socket.error:
+            pass
+    if not lst:
         return None
+    return ','.join(lst)
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 637f1da..7b1841b 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,3 +3,5 @@
 flake8==3.7.9
 tox==3.20.0
 pytest==4.6.9
+coverage
+IPy
diff --git a/requirements.txt b/requirements.txt
index 566083c..31843ba 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
+dnspython
 requests==2.22.0
diff --git a/setup.py b/setup.py
index 681f62a..e4b2ef8 100644
--- a/setup.py
+++ b/setup.py
@@ -13,6 +13,7 @@
 
 install_requires = [
     "requests>=2.0",
+    "dnspython",
 ]
 
 if sys.version_info[:2] < (2, 7):
diff --git a/test/test_noipy.py b/test/test_noipy.py
index 44eeab0..a7387de 100644
--- a/test/test_noipy.py
+++ b/test/test_noipy.py
@@ -5,9 +5,10 @@
 # Copyright (c) 2013 Pablo O Vieira (povieira)
 # See README.rst and LICENSE for details.
 
+from IPy import IP
+
 import getpass
 import os
-import re
 import shutil
 import unittest
 
@@ -32,12 +33,18 @@ def tearDown(self):
             shutil.rmtree(self.test_dir)
 
     def test_get_ip(self):
-        ip = utils.get_ip()
+        ips = utils.get_ip()
 
-        self.assertTrue(re.match(VALID_IP_REGEX, ip), "get_ip() failed.")
+        for ip in ips.split(','):
+            try:
+                IP(ip)
+            except Exception as ex:
+                self.assertIsNone(ex, "get_ip() failed.")
 
         # monkey patch for testing (forcing ConnectionError)
         utils.HTTPBIN_URL = "http://example.nothing"
+        utils.IP4ONLY_URL = "http://example.nothing"
+        utils.IP6ONLY_URL = "http://example.nothing"
 
         ip = utils.get_ip()
         self.assertTrue(ip is None, "get_ip() should return None. IP=%s" % ip)
@@ -56,7 +63,7 @@ class PluginsTest(unittest.TestCase):
 
     def setUp(self):
         self.parser = main.create_parser()
-        self.test_ip = "10.1.2.3"
+        self.test_ip = "10.1.2.3,2004::1:2:3:4"
 
     def tearDown(self):
         pass
@@ -168,7 +175,7 @@ class AuthInfoTest(unittest.TestCase):
 
     def setUp(self):
         self.parser = main.create_parser()
-        self.test_ip = "10.1.2.3"
+        self.test_ip = "10.1.2.3,2004::1:2:3:4"
         self.test_dir = os.path.join(os.path.expanduser("~"), "noipy_test")
 
     def tearDown(self):
diff --git a/tox.ini b/tox.ini
index 609ac50..a55168d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,6 +6,7 @@ passenv = CI TRAVIS_BUILD_ID TRAVIS TRAVIS_BRANCH TRAVIS_JOB_NUMBER TRAVIS_PULL_
 deps =
     -rrequirements-dev.txt
     py{26,27,35,36,37},pypy,pypy3: coverage
+    py{26,27,35,36,37},pypy,pypy3: IPy
 
 commands =
     python --version