diff --git a/README.md b/README.md
index ab5609ae0..b76bada04 100644
--- a/README.md
+++ b/README.md
@@ -119,7 +119,7 @@ Validator                               | Description
 **isIn(str, values)**                   | check if the string is in a array of allowed values.
 **isInt(str [, options])**              | check if the string is an integer.<br/><br/>`options` is an object which can contain the keys `min` and/or `max` to check the integer is within boundaries (e.g. `{ min: 10, max: 99 }`). `options` can also contain the key `allow_leading_zeroes`, which when set to false will disallow integer values with leading zeroes (e.g. `{ allow_leading_zeroes: false }`). Finally, `options` can contain the keys `gt` and/or `lt` which will enforce integers being greater than or less than, respectively, the value provided (e.g. `{gt: 1, lt: 4}` for a number between 1 and 4).
 **isIP(str [, version])**               | check if the string is an IP (version 4 or 6).
-**isIPRange(str)**                      | check if the string is an IP Range(version 4 only).
+**isIPRange(str [, version])**          | check if the string is an IP Range (version 4 or 6).
 **isISBN(str [, version])**             | check if the string is an ISBN (version 10 or 13).
 **isISIN(str)**                         | check if the string is an [ISIN][ISIN] (stock/security identifier).
 **isISO8601(str)**                      | check if the string is a valid [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) date. <br/>`options` is an object which defaults to `{ strict: false, strictSeparator: false }`. If `strict` is true, date strings with invalid dates like `2009-02-29` will be invalid. If `strictSeparator` is true, date strings with date and time separated by anything other than a T will be invalid.
diff --git a/src/lib/isIPRange.js b/src/lib/isIPRange.js
index ffb4e1afa..5bb6916c5 100644
--- a/src/lib/isIPRange.js
+++ b/src/lib/isIPRange.js
@@ -1,9 +1,11 @@
 import assertString from './util/assertString';
 import isIP from './isIP';
 
-const subnetMaybe = /^\d{1,2}$/;
+const subnetMaybe = /^\d{1,3}$/;
+const v4Subnet = 32;
+const v6Subnet = 128;
 
-export default function isIPRange(str) {
+export default function isIPRange(str, version = '') {
   assertString(str);
   const parts = str.split('/');
 
@@ -21,5 +23,25 @@ export default function isIPRange(str) {
     return false;
   }
 
-  return isIP(parts[0], 4) && parts[1] <= 32 && parts[1] >= 0;
+  const isValidIP = isIP(parts[0], version);
+  if (!isValidIP) {
+    return false;
+  }
+
+  // Define valid subnet according to IP's version
+  let expectedSubnet = null;
+  switch (String(version)) {
+    case '4':
+      expectedSubnet = v4Subnet;
+      break;
+
+    case '6':
+      expectedSubnet = v6Subnet;
+      break;
+
+    default:
+      expectedSubnet = isIP(parts[0], '6') ? v6Subnet : v4Subnet;
+  }
+
+  return parts[1] <= expectedSubnet && parts[1] >= 0;
 }
diff --git a/test/validators.js b/test/validators.js
index 34b6474e8..1e5aa1547 100644
--- a/test/validators.js
+++ b/test/validators.js
@@ -872,18 +872,88 @@ describe('Validators', () => {
         '127.0.0.1/24',
         '0.0.0.0/0',
         '255.255.255.0/32',
+        '::/0',
+        '::/128',
+        '2001::/128',
+        '2001:800::/128',
+        '::ffff:127.0.0.1/128',
       ],
       invalid: [
+        'abc',
         '127.200.230.1/35',
         '127.200.230.1/-1',
         '1.1.1.1/011',
-        '::1/64',
         '1.1.1/24.1',
         '1.1.1.1/01',
         '1.1.1.1/1.1',
         '1.1.1.1/1.',
         '1.1.1.1/1/1',
         '1.1.1.1',
+        '::1',
+        '::1/164',
+        '2001::/240',
+        '2001::/-1',
+        '2001::/001',
+        '2001::/24.1',
+        '2001:db8:0000:1:1:1:1:1',
+        '::ffff:127.0.0.1',
+      ],
+    });
+    test({
+      validator: 'isIPRange',
+      args: [4],
+      valid: [
+        '127.0.0.1/1',
+        '0.0.0.0/1',
+        '255.255.255.255/1',
+        '1.2.3.4/1',
+        '255.0.0.1/1',
+        '0.0.1.1/1',
+      ],
+      invalid: [
+        'abc',
+        '::1',
+        '2001:db8:0000:1:1:1:1:1',
+        '::ffff:127.0.0.1',
+        '137.132.10.01',
+        '0.256.0.256',
+        '255.256.255.256',
+      ],
+    });
+    test({
+      validator: 'isIPRange',
+      args: [6],
+      valid: [
+        '::1/1',
+        '2001:db8:0000:1:1:1:1:1/1',
+        '::ffff:127.0.0.1/1',
+      ],
+      invalid: [
+        'abc',
+        '127.0.0.1',
+        '0.0.0.0',
+        '255.255.255.255',
+        '1.2.3.4',
+        '::ffff:287.0.0.1',
+        '::ffff:287.0.0.1/254',
+        '%',
+        'fe80::1234%',
+        'fe80::1234%1%3%4',
+        'fe80%fe80%',
+      ],
+    });
+    test({
+      validator: 'isIPRange',
+      args: [10],
+      valid: [],
+      invalid: [
+        'abc',
+        '127.0.0.1/1',
+        '0.0.0.0/1',
+        '255.255.255.255/1',
+        '1.2.3.4/1',
+        '::1/1',
+        '2001:db8:0000:1:1:1:1:1/1',
       ],
     });
   });