diff --git a/perl-xCAT/xCAT/NetworkUtils.pm b/perl-xCAT/xCAT/NetworkUtils.pm
index 514e39f8a..7dba4a965 100755
--- a/perl-xCAT/xCAT/NetworkUtils.pm
+++ b/perl-xCAT/xCAT/NetworkUtils.pm
@@ -2156,7 +2156,7 @@ sub isIpaddr
         return 0;
     }
 
-    if ($1 > 255 || $1 =~ /^0/ || $2 > 255 || $2 =~ /^0+(\d)/ || $3 > 255 || $3 =~ /^0+(\d)/ || $4 > 255 || $4 =~ /^0+(\d)/)
+    if ($1 > 255 || $1 =~ /^0/ || $2 > 255 || $2 =~ /^0\d/ || $3 > 255 || $3 =~ /^0\d/ || $4 > 255 || $4 =~ /^0\d/)
     {
         return 0;
     }