diff --git a/templates/whoisdb/create_js.html b/templates/whoisdb/create_js.html
index 44f2006..67f4a58 100644
--- a/templates/whoisdb/create_js.html
+++ b/templates/whoisdb/create_js.html
@@ -41,7 +41,7 @@ function findPrefix(size, step) {
 	var parentRangeOpt = $('#id_'+ef+'parent_range option:selected');
 	if(parentRangeOpt.val()) {
 		var prefixLen = null;
-		var m = netInpText.match("([0-9.:]+/)?(\\d+)");
+		var m = netInpText.match("([0-9a-f.:]+/)?(\\d+)");
 		console.log(prefixLen)
 		console.log(netInpText);
 		if(m) {