--- a/utils.c
+++ b/utils.c
@@ -114,6 +114,7 @@ int
 parse_ip_and_netmask(int af, const char *str, void *addr, unsigned int *netmask)
 {
 	char *astr = alloca(strlen(str) + 1);
+	int ret = 0;
 
 	strcpy(astr, str);
 	if (!split_netmask(astr, netmask, af == AF_INET6))
@@ -127,7 +128,16 @@ parse_ip_and_netmask(int af, const char
 			return 0;
 	}
 
-	return inet_pton(af, astr, addr);
+	ret = inet_pton(af, astr, addr);
+	if ((ret > 0) && (af == AF_INET)) {
+                struct in_addr *ip4_addr = (struct in_addr *)addr;
+                uint32_t host_addr = ntohl(ip4_addr->s_addr);
+
+                if (!IN_CLASSA(host_addr) && !IN_CLASSB(host_addr) && !IN_CLASSC(host_addr)) {
+                        ret = 0;
+                }
+        }
+        return ret;
 }
 
 char *