feat: add a new CIDR6 search method

src/Domain/Helper/IP6Helper.php

@@ -28,6 +28,18 @@ class IP6Helper {
                     return;
                 }
 
+                $search = shell_exec(
+                    implode(' | ', [
+                        'whois ' . $ip,
+                        'grep CIDR',
+                        'grep -v "/0"',
+                        'head -n 1',
+                        "awk '{print $2}'",
+                        "grep -oE '^([0-9a-fA-F]{1,4}:){1,7}(:|[0-9a-fA-F]{1,4})(:[0-9a-fA-F]{1,4}){0,6}/[0-9]+$'",
+                    ])
+                );
+
+                if (!$search) {
                     $search = shell_exec(
                         implode(' | ', [
                             'whois -a ' . $ip,
@@ -37,6 +49,7 @@ class IP6Helper {
                             "awk '{print $2}'",
                         ])
                     );
+                }
 
                 if (!$search) {
                     $search = shell_exec(