diff --git a/web/cli.php b/web/cli.php
new file mode 100644
index 0000000..3749386
--- /dev/null
+++ b/web/cli.php
@@ -0,0 +1,103 @@
+<?php
+
+require_once "utils.php";
+
+/// Print list structural under command line.
+///
+///    Example
+/// ┏-----------┓
+/// | xxxx      |
+/// | xxxxxxxxx |
+/// | xxxxxx    |
+/// ┗-----------┛
+function showCliList(string $title, array $content): void {
+    $contentLen = 0;
+    foreach ($content as $row) { // found the longest row
+        $contentLen = ($contentLen < stringLen($row)) ? stringLen($row) : $contentLen;
+    }
+
+    $bodyLen = $contentLen + 4; // add 4-slots -> `| xxx |`
+    $titleLen = stringLen($title);
+    $bodyOffset = $titleOffset = 0;
+    if ($titleLen > $bodyLen) { // title longer than body
+        $bodyOffset = floor(($titleLen - $bodyLen) / 2); // body move right
+    } else {
+        $titleOffset = floor(($bodyLen - $titleLen) / 2); // title move right
+    }
+
+    printf("%s%s\n", stringGen($titleOffset), $title); // show list title
+    printf("%s┏-%s-┓\n", stringGen($bodyOffset), stringGen($contentLen, '-'));
+    foreach ($content as $row) { // show list body
+        printf("%s| %s%s |\n",
+            stringGen($bodyOffset), $row, stringGen($contentLen - stringLen($row))
+        );
+    }
+    printf("%s┗-%s-┛\n", stringGen($bodyOffset), stringGen($contentLen, '-'));
+}
+
+/// Print table with two columns under command line.
+///
+///      Example
+/// ┏---------------┓
+/// | xxx  | xxxxxx |
+/// | xxxx | xxxxxx |
+/// | xx   | xxxxxx |
+/// ┗---------------┛
+function showCliTable(string $title, array $content): void {
+    $length = 0;
+    foreach ($content as $row => $_) { // found the longest item
+        $length = ($length < stringLen($row)) ? stringLen($row) : $length;
+    }
+    $cache = array();
+    foreach ($content as $row_1 => $row_2) {
+        $cache[] = $row_1 . stringGen($length - stringLen($row_1)) . ' | ' . $row_2;
+    }
+    showCliList($title, $cache); // render as list
+}
+
+class CliOutput {
+    /// Print help message under command line.
+    public function showHelp(string $host, string $port): void {
+        if (isIPv6($host)) {
+            $host = "[$host]"; // add ipv6 bracket
+        }
+        $kmsServer = $host;
+        $urlPrefix = "http://$host";
+        if ($port != 1688) { // not default port
+            $kmsServer = "$kmsServer:$port"; // add service port
+        }
+
+        echo PHP_EOL;
+        showCliList('Windows Activation', [
+            'slmgr /upk',
+            'slmgr /ipk KMS_KEY',
+            "slmgr /skms $kmsServer",
+            'slmgr /ato',
+            'slmgr /dlv',
+        ]);
+        echo "\nKMS_KEY\n";
+        echo "  -> $urlPrefix/win\n";
+        echo "  -> $urlPrefix/win-server\n";
+        echo "\nOffice\n";
+        echo "  -> $urlPrefix/office\n\n";
+    }
+
+    /// Print GVLKs under command line.
+    public function showGvlks(bool $isWinServer): void {
+        echo PHP_EOL;
+        foreach (loadGvlks($isWinServer) as $version => $content) {
+            showCliTable($version, $content);
+            echo PHP_EOL;
+        }
+    }
+
+}
+
+$cli = new CliOutput();
+//$cli->showHelp('kms.343.re', 1688);
+//$cli->showHelp('kms.343.re', 1689);
+//$cli->showHelp('1.1.1.1', 1689);
+//$cli->showHelp('fc00::', 1689);
+
+$cli->showGvlks(false);
+$cli->showGvlks(true);
diff --git a/web/utils.php b/web/utils.php
index fe2b777..dcadf75 100644
--- a/web/utils.php
+++ b/web/utils.php
@@ -1,5 +1,13 @@
 <?php
 
+function isIPv4(string $ip): bool {
+    return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
+}
+
+function isIPv6(string $ip): bool {
+    return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6);
+}
+
 function getLang(): string { // kms-server working language
     // load from env
     return 'zh-cn';
@@ -18,27 +26,3 @@ function loadGvlks(bool $isWinServer = false): array { // load kms client keys f
     $gvlkData = json_decode(file_get_contents($assetPath), true);
     return $isWinServer ? $gvlkData['win-server'] : $gvlkData['win'];
 }
-
-function showCliTable(string $title, array $content): void { // print cli table with two columns
-    $leftLen = 0;
-    $rightLen = 0;
-    foreach ($content as $col_1 => $col_2) { // found the longest length
-        $leftLen = ($leftLen < stringLen($col_1)) ? stringLen($col_1) : $leftLen;
-        $rightLen = ($rightLen < stringLen($col_2)) ? stringLen($col_2) : $rightLen;
-    }
-    $titleOffset = floor(($leftLen + $rightLen + 7 - stringLen($title)) / 2);
-
-    echo stringGen($titleOffset) . $title . PHP_EOL; // show table title
-    echo '┏' . stringGen($leftLen + $rightLen + 5, '-') . '┓' . PHP_EOL;
-    foreach ($content as $col_1 => $col_2) { // show table body
-        echo '| ' . $col_1 . stringGen($leftLen - stringLen($col_1)) . ' | ';
-        echo $col_2 . stringGen($rightLen - stringLen($col_2)) . ' |' . PHP_EOL;
-    }
-    echo '┗' . stringGen($leftLen + $rightLen + 5, '-') . '┛' . PHP_EOL;
-}
-
-echo PHP_EOL;
-foreach (loadGvlks(false) as $version => $content) {
-    showCliTable($version, $content);
-    echo PHP_EOL;
-}