diff --git a/rest_framework_tracking/base_mixins.py b/rest_framework_tracking/base_mixins.py
index a4725a5..0ab2a4e 100644
--- a/rest_framework_tracking/base_mixins.py
+++ b/rest_framework_tracking/base_mixins.py
@@ -111,11 +111,8 @@ def _get_path(self, request):
 
     def _get_ip_address(self, request):
         """Get the remote ip address the request was generated from."""
-        ipaddr = request.META.get("HTTP_X_FORWARDED_FOR", None)
-        if ipaddr:
-            ipaddr = ipaddr.split(",")[0]
-        else:
-            ipaddr = request.META.get("REMOTE_ADDR", "").split(",")[0]
+        raw_possibles = request.META.get("HTTP_X_FORWARDED_FOR", "").split(",")
+        raw_possibles += request.META.get("REMOTE_ADDR", "").split(",")
 
         # Account for IPv4 and IPv6 addresses, each possibly with port appended. Possibilities are:
         # <ipv4 address>
@@ -123,15 +120,25 @@ def _get_ip_address(self, request):
         # <ipv4 address>:port
         # [<ipv6 address>]:port
         # Note that ipv6 addresses are colon separated hex numbers
-        possibles = (ipaddr.lstrip("[").split("]")[0], ipaddr.split(":")[0])
-
+        raw_possibles = [addr.strip() for addr in raw_possibles]
+        possibles = []
+        for possible_addr in raw_possibles:
+            if '[' in possible_addr:
+                # IPv6 with port
+                possibles.append(possible_addr.rsplit(":", 1)[0].strip("[]"))
+            elif possible_addr.count(":") == 1:
+                # IPv4 with port
+                possibles.append(possible_addr.split(":")[0])
+            else:
+                # IPv4/IPv6 without port and others
+                possibles.append(possible_addr)
         for addr in possibles:
             try:
                 return str(ipaddress.ip_address(addr))
             except ValueError:
                 pass
 
-        return ipaddr
+        return raw_possibles[0]
 
     def _get_view_name(self, request):
         """Get view name."""
diff --git a/tests/test_mixins.py b/tests/test_mixins.py
index a9eb79f..7dbb9e1 100644
--- a/tests/test_mixins.py
+++ b/tests/test_mixins.py
@@ -105,6 +105,14 @@ def test_log_ip_xforwarded_list(self):
         log = APIRequestLog.objects.first()
         self.assertEqual(log.remote_addr, "127.0.0.8")
 
+    def test_log_ip_xforwarded_list_with_unknown_ip(self):
+        request = APIRequestFactory().get("/logging")
+        request.META["HTTP_X_FORWARDED_FOR"] = "unknown, 128.1.1.9"
+
+        MockLoggingView.as_view()(request).render()
+        log = APIRequestLog.objects.first()
+        self.assertEqual(log.remote_addr, "128.1.1.9")
+
     def test_log_host(self):
         self.client.get("/logging")
         log = APIRequestLog.objects.first()
diff --git a/tox.ini b/tox.ini
index c171b37..9a2a23c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@ tox_pyenv_fallback = True
 commands = python -V
            pip install --upgrade pip pipenv
            pipenv install --skip-lock
-           ./runtests.py --fast
+           python runtests.py --fast
 passenv =
     DATABASE_URL
     PYTHON_VERSION