diff --git a/core/api_views.py b/core/api_views.py
index bf6ee2ba..2f01b503 100644
--- a/core/api_views.py
+++ b/core/api_views.py
@@ -5,7 +5,13 @@ import ipaddress
 from rest_framework import viewsets, status
 from rest_framework.response import Response
 from django.shortcuts import get_object_or_404
-from .models import UserAgent, StreamProfile, CoreSettings, STREAM_HASH_KEY
+from .models import (
+    UserAgent,
+    StreamProfile,
+    CoreSettings,
+    STREAM_HASH_KEY,
+    NETWORK_ACCESS,
+)
 from .serializers import (
     UserAgentSerializer,
     StreamProfileSerializer,
@@ -63,18 +69,41 @@ class CoreSettingsViewSet(viewsets.ModelViewSet):
     def check(self, request, *args, **kwargs):
         data = request.data
 
-        client_ip = ipaddress.ip_address(get_client_ip(request))
-        in_network = []
-        key = data.get("key")
-        value = json.loads(data.get("value", "{}"))
-        for key, val in value.items():
-            cidrs = val.split(",")
-            for cidr in cidrs:
-                network = ipaddress.ip_network(cidr)
-                if client_ip not in network:
-                    in_network.append(cidr)
+        if data.get("key") == NETWORK_ACCESS:
+            client_ip = ipaddress.ip_address(get_client_ip(request))
 
-        return Response(in_network, status=status.HTTP_200_OK)
+            in_network = {}
+            invalid = []
+
+            value = json.loads(data.get("value", "{}"))
+            for key, val in value.items():
+                in_network[key] = []
+                cidrs = val.split(",")
+                for cidr in cidrs:
+                    try:
+                        network = ipaddress.ip_network(cidr)
+
+                        if client_ip in network:
+                            in_network[key] = []
+                            break
+
+                        in_network[key].append(cidr)
+                    except:
+                        invalid.append(cidr)
+
+            if len(invalid) > 0:
+                return Response(
+                    {
+                        "error": True,
+                        "message": "Invalid CIDR(s)",
+                        "data": invalid,
+                    },
+                    status=status.HTTP_200_OK,
+                )
+
+            return Response(in_network, status=status.HTTP_200_OK)
+
+        return Response({}, status=status.HTTP_200_OK)
 
 
 @swagger_auto_schema(
diff --git a/frontend/src/pages/Settings.jsx b/frontend/src/pages/Settings.jsx
index b4fc37cc..073af337 100644
--- a/frontend/src/pages/Settings.jsx
+++ b/frontend/src/pages/Settings.jsx
@@ -34,6 +34,7 @@ const SettingsPage = () => {
 
   const [accordianValue, setAccordianValue] = useState(null);
   const [networkAccessSaved, setNetworkAccessSaved] = useState(false);
+  const [networkAccessError, setNetworkAccessError] = useState(null);
   const [networkAccessConfirmOpen, setNetworkAccessConfirmOpen] =
     useState(false);
   const [netNetworkAccessConfirmCIDRs, setNetNetworkAccessConfirmCIDRs] =
@@ -316,6 +317,21 @@ const SettingsPage = () => {
       acc[key] = '0.0.0.0/0';
       return acc;
     }, {}),
+    validate: Object.keys(NETWORK_ACCESS_OPTIONS).reduce((acc, key) => {
+      acc[key] = (value) => {
+        const cidrs = value.split(',');
+        for (const cidr of cidrs) {
+          if (cidr.match(/^([0-9]{1,3}\.){3}[0-9]{1,3}\/\d+$/)) {
+            continue;
+          }
+
+          return 'Invalid CIDR range';
+        }
+
+        return null;
+      };
+      return acc;
+    }, {}),
   });
 
   useEffect(() => {
@@ -383,16 +399,24 @@ const SettingsPage = () => {
 
   const onNetworkAccessSubmit = async () => {
     setNetworkAccessSaved(false);
+    setNetworkAccessError(null);
     const check = await API.checkSetting({
       ...settings['network-access'],
       value: JSON.stringify(networkAccessForm.getValues()),
     });
 
-    if (check.length == 0) {
+    if (check.error && check.message) {
+      setNetworkAccessError(`${check.message}: ${check.data}`);
+      return;
+    }
+
+    // For now, only warn if we're blocking the UI
+    const blockedAccess = check.UI;
+    if (blockedAccess.length == 0) {
       return saveNetworkAccess();
     }
 
-    setNetNetworkAccessConfirmCIDRs(check);
+    setNetNetworkAccessConfirmCIDRs(blockedAccess);
     setNetworkAccessConfirmOpen(true);
   };
 
@@ -627,6 +651,13 @@ const SettingsPage = () => {
                               title="Saved Successfully"
                             ></Alert>
                           )}
+                          {networkAccessError && (
+                            <Alert
+                              variant="light"
+                              color="red"
+                              title={networkAccessError}
+                            ></Alert>
+                          )}
                           {Object.entries(NETWORK_ACCESS_OPTIONS).map(
                             ([key, config]) => {
                               return (
@@ -672,8 +703,8 @@ const SettingsPage = () => {
         message={
           <>
             <Text>
-              Your client is included in the following CIDRs and could block
-              access Are you sure you want to proceed?
+              Your client is not included in the allowed networks for the web
+              UI. Are you sure you want to proceed?
             </Text>
 
             <ul>