diff --git a/lib/utils/ip.js b/lib/utils/ip.js
index d53a879f..f92fadd7 100644
--- a/lib/utils/ip.js
+++ b/lib/utils/ip.js
@@ -124,6 +124,8 @@ IP.version = function version(str) {
  */
 
 IP.isV4Format = function(str) {
+  if (str.length < 7)
+    return false;
   return ipv4Regex.test(str);
 };