diff --git a/app/common/services/api-utils.js b/app/common/services/api-utils.js
index 43d4772..d7e4e7f 100644
--- a/app/common/services/api-utils.js
+++ b/app/common/services/api-utils.js
@@ -56,6 +56,11 @@
                   });
           return deferred.promise;
         },
+        validIPV4IP: function(ip) {
+          // Checks for [0-255].[0-255].[0-255].[0-255]
+          return ip.match(
+              /\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b/);
+        },
         getHostState: function() {
           var deferred = $q.defer();
           $http({
diff --git a/app/configuration/controllers/network-controller.html b/app/configuration/controllers/network-controller.html
index d237d47..41ab8a3 100644
--- a/app/configuration/controllers/network-controller.html
+++ b/app/configuration/controllers/network-controller.html
@@ -61,9 +61,10 @@
 						<label for="net-config__subnet" class="inline">Gateway</label>
 						<input id="net-config__subnet" type="text" ng-disabled="interface.DHCPEnabled" value="" ng-model="ipv4.Gateway"/>
 					</div>
+					<!-- This netmask prefix length max only works with IPV4 -->
 					<div class="column small-12 large-4">
 						<label for="net-config__default-gateway" class="inline">Netmask Prefix Length</label>
-						<input id="net-config__default-gateway" type="text" ng-disabled="interface.DHCPEnabled"  ng-model="ipv4.PrefixLength"/>
+						<input id="net-config__default-gateway" type="number" min="1" max="32" step="1" ng-disabled="interface.DHCPEnabled"  ng-model="ipv4.PrefixLength"/>
 					</div>
 				</fieldset>
 			</fieldset>
diff --git a/app/configuration/controllers/network-controller.js b/app/configuration/controllers/network-controller.js
index 6ebbf4f..d5fdc00 100644
--- a/app/configuration/controllers/network-controller.js
+++ b/app/configuration/controllers/network-controller.js
@@ -58,6 +58,30 @@
         // Set IPV4 IP Addresses, Netmask Prefix Lengths, and Gateways
         if (!$scope.interface.DHCPEnabled) {
           for (var i in $scope.interface.ipv4.values) {
+            if (!APIUtils.validIPV4IP(
+                    $scope.interface.ipv4.values[i].Address)) {
+              $scope.set_network_error =
+                  $scope.interface.ipv4.values[i].Address +
+                  ' invalid IP parameter';
+              $scope.loading = false;
+              return;
+            }
+            if (!APIUtils.validIPV4IP(
+                    $scope.interface.ipv4.values[i].Gateway)) {
+              $scope.set_network_error =
+                  $scope.interface.ipv4.values[i].Address +
+                  ' invalid gateway parameter';
+              $scope.loading = false;
+              return;
+            }
+            // The netmask prefix length will be undefined if outside range
+            if (!$scope.interface.ipv4.values[i].PrefixLength) {
+              $scope.set_network_error =
+                  $scope.interface.ipv4.values[i].Address +
+                  ' invalid Prefix Length parameter';
+              $scope.loading = false;
+              return;
+            }
             if ($scope.interface.ipv4.values[i].Address !=
                     $scope.old_interface.ipv4.values[i].Address ||
                 $scope.interface.ipv4.values[i].PrefixLength !=