diff --git a/noipy/utils.py b/noipy/utils.py
index 60c6ec8..deec47e 100644
--- a/noipy/utils.py
+++ b/noipy/utils.py
@@ -9,8 +9,6 @@
 
 import requests
 
-HTTPBIN_URL = 'https://httpbin.org/ip'
-
 try:
     input = raw_input
 except NameError:
@@ -21,10 +19,10 @@ def read_input(message):
     return input(message)
 
 
-def get_ip():
+def get_ip(httpbin_url):
     """Return machine's origin IP address."""
     try:
-        r = requests.get(HTTPBIN_URL)
+        r = requests.get(httpbin_url)
         return r.json()['origin'] if r.status_code == 200 else None
     except requests.exceptions.ConnectionError:
         return None
diff --git a/test/test_noipy.py b/test/test_noipy.py
index fe72800..6d0602c 100644
--- a/test/test_noipy.py
+++ b/test/test_noipy.py
@@ -31,14 +31,12 @@ def tearDown(self):
             shutil.rmtree(self.test_dir)
 
     def test_get_ip(self):
-        ip = utils.get_ip()
+        ip = utils.get_ip('https://httpbin.org/ip')
 
         self.assertTrue(re.match(VALID_IP_REGEX, ip), 'get_ip() failed.')
 
         # monkey patch for testing (forcing ConnectionError)
-        utils.HTTPBIN_URL = 'http://example.nothing'
-
-        ip = utils.get_ip()
+        ip = utils.get_ip('http://example.nothing')
         self.assertTrue(ip is None, 'get_ip() should return None. IP={}'.format(ip))
 
     def test_get_dns_ip(self):