diff --git a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/util/Utils.kt b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/util/Utils.kt
index ae85000c..33aa5933 100644
--- a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/util/Utils.kt
+++ b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/util/Utils.kt
@@ -178,7 +178,7 @@ object Utils {
             //CIDR
             if (addr.indexOf("/") > 0) {
                 val arr = addr.split("/")
-                if (arr.count() == 2 && Integer.parseInt(arr[1]) > 0) {
+                if (arr.count() == 2 && Integer.parseInt(arr[1]) > -1) {
                     addr = arr[0]
                 }
             }
diff --git a/V2rayNG/app/src/test/kotlin/com/v2ray/ang/ExampleUnitTest.kt b/V2rayNG/app/src/test/kotlin/com/v2ray/ang/ExampleUnitTest.kt
index dd21d55a..8e7961ff 100644
--- a/V2rayNG/app/src/test/kotlin/com/v2ray/ang/ExampleUnitTest.kt
+++ b/V2rayNG/app/src/test/kotlin/com/v2ray/ang/ExampleUnitTest.kt
@@ -20,6 +20,7 @@ class UtilTest {
 
       assertTrue(Utils.isIpAddress("127.0.0.1" ))
       assertTrue(Utils.isIpAddress("127.0.0.1:80" ))
+      assertTrue(Utils.isIpAddress("0.0.0.0/0" ))
       assertTrue(Utils.isIpAddress("::1" ))
       assertTrue(Utils.isIpAddress("[::1]:80" ))
       assertTrue(Utils.isIpAddress("2605:2700:0:3::4713:93e3" ))
@@ -28,6 +29,7 @@ class UtilTest {
       assertTrue(Utils.isIpAddress("[::ffff:192.168.173.22]:80" ))
       assertTrue(Utils.isIpAddress("1::" ))
       assertTrue(Utils.isIpAddress("::" ))
+      assertTrue(Utils.isIpAddress("::/0" ))
       assertTrue(Utils.isIpAddress("10.24.56.0/24" ))
       assertTrue(Utils.isIpAddress("2001:4321::1" ))
       assertTrue(Utils.isIpAddress("240e:1234:abcd:12::6666" ))