diff --git a/src/vnm/AddressRange.cc b/src/vnm/AddressRange.cc
index ca0987e552..c3f3cfbf72 100644
--- a/src/vnm/AddressRange.cc
+++ b/src/vnm/AddressRange.cc
@@ -641,6 +641,11 @@ int AddressRange::ip_to_i(const string& _ip, unsigned int& i_ip) const
         return -1;
     }
 
+    if ( ip.find_first_not_of("0123456789 ") != std::string::npos )
+    {
+        return -1;
+    }
+
     iss.str(ip);
 
     i_ip = 0;
@@ -649,7 +654,7 @@ int AddressRange::ip_to_i(const string& _ip, unsigned int& i_ip) const
     {
         iss >> dec >> tmp >> ws;
 
-        if ( tmp > 255 )
+        if ( tmp > 255 || iss.fail() )
         {
             return -1;
         }