diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c18dd8d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+__pycache__/
diff --git a/src/ddns_update.py b/src/ddns_update.py
index 86b8ea6..befd4ae 100755
--- a/src/ddns_update.py
+++ b/src/ddns_update.py
@@ -8,6 +8,7 @@ from os import environ
 from netifaces import interfaces, ifaddresses, AF_INET6
 from ipaddress import ip_address
 from time import sleep
+import socket
 
 logging.basicConfig(level=logging.INFO, format="%(asctime)-15s - %(name)s %(levelname)-8s: %(message)s")
 log = logging.getLogger("ddns updater")
@@ -33,7 +34,7 @@ def response_successful(response_text):
 
 
 def ddns_update(host, key, ip):
-    url = f"https://dyndns.strato_.com/nic/update?hostname={host}&myip={ip}"
+    url = f"https://dyndns.strato.com/nic/update?hostname={host}&myip={ip}"
 
     try:
         response = requests.get(url, auth=(host, key), timeout=3)
@@ -45,7 +46,7 @@ def ddns_update(host, key, ip):
         response.raise_for_status()
 
         if not response_successful(response.text):
-            raise RequestException("update failed")
+            raise RequestException(f"update to {ip} failed")
 
     except RequestException as error:
         log.error(response.text.strip())
@@ -53,7 +54,7 @@ def ddns_update(host, key, ip):
         return False
 
     log.debug(response.text.strip())
-    log.info("update successful")
+    log.info(f"update to {ip} successful")
 
     return True
 
@@ -62,17 +63,17 @@ def ddns_update(host, key, ip):
 @click.option(
     "--host",
     required=True,
-    default=lambda: environ.get("DDNS_HOST", None),
     help="The dns name to update",
 )
 @click.option(
     "--key",
     required=True,
-    default=lambda: environ.get("DDNS_KEY", None),
     help="The ddns authorization key",
 )
 def loop_ddns_update(host, key):
-    last_ip = None
+    last_ip = ip_address(socket.getaddrinfo(host, None, socket.AF_INET6)[0][4][0])
+    log.info(f"currently registered address: {last_ip}")
+
     while True:
         current_ip = get_global_ipv6()
         if current_ip != last_ip:
@@ -84,4 +85,5 @@ def loop_ddns_update(host, key):
 
 
 if __name__ == "__main__":
-    loop_ddns_update()
+    log.info("starting...")
+    loop_ddns_update(auto_envvar_prefix="DDNS")
diff --git a/src/test_ddns_update.py b/src/test_ddns_update.py
new file mode 100644
index 0000000..a091beb
--- /dev/null
+++ b/src/test_ddns_update.py
@@ -0,0 +1,20 @@
+import unittest
+from .ddns_update import response_successful
+
+class TestDdnsUpdate(unittest.TestCase):
+
+    def test_response_successful(self):
+        self.assertTrue(response_successful("good"))
+        self.assertTrue(response_successful("good 1.2.3.4"))
+        self.assertTrue(response_successful("good abcd:abcd:abcd:abcd:abcd:abcd:abcd:abcd"))
+        self.assertTrue(response_successful("nochg"))
+        self.assertTrue(response_successful("nochg 1.2.3.4"))
+        self.assertTrue(response_successful("nochg abcd:abcd:abcd:abcd:abcd:abcd:abcd:abcd"))
+        self.assertFalse(response_successful("notfqdn"))
+        self.assertFalse(response_successful("nohost"))
+        self.assertFalse(response_successful("numhost"))
+        self.assertFalse(response_successful("abuse"))
+        self.assertFalse(response_successful("badagent"))
+        self.assertFalse(response_successful("dnserr"))
+        self.assertFalse(response_successful("911"))
+