diff --git a/admin/templates/default/config.xet b/admin/templates/default/config.xet
index 274b0ba816..1dfaf67fe1 100644
--- a/admin/templates/default/config.xet
+++ b/admin/templates/default/config.xet
@@ -211,7 +211,7 @@
 				<row>
 					<description value="Comma-separated IP addresses white-listed from above blocking (:optional number of attempts)"/>
 					<textbox id="newsettings[unsuccessful_ip_whitelist]" size="64" blur="X.X.X.X[:N], ..."
-						validator="/^(\\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(:\d+)?,? *)*$/"/>
+						validator="/^(((\\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))(:\d+)?)(, ?((\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))(:\d+)?))*)?$/"/>
 				</row>
 				<row>
 					<description value="How many minutes should an account or IP be blocked (default 1) ?" label="%s:"/>