diff --git a/backend/getInfo.php b/backend/getInfo.php
index d8d2466..9b9fbc1 100644
--- a/backend/getInfo.php
+++ b/backend/getInfo.php
@@ -28,20 +28,20 @@ function getIPInfo($ip) {
         $info['loc'] = $rawIspInfo['loc'];
         $info['isp'] = getIsp($rawIspInfo);
     }
-    $info['cidr'] = $detail['beginIP'] . ' - ' . $detail['endIP'];
+    $info['scope'] = tryCIDR($detail['beginIP'], $detail['endIP']);
     $info['detail'] = $detail['dataA'] . $detail['dataB'];
 
     if ($_GET['cli'] == "true") { // 使用命令行模式
-        $cli = "IP: ".$info['ip'].PHP_EOL;
-        $cli .= "AS: ".$info['as'].PHP_EOL;
-        $cli .= "City: ".$info['city'].PHP_EOL;
-        $cli .= "Region: ".$info['region'].PHP_EOL;
-        $cli .= "Country: ".$info['country'].PHP_EOL;
-        $cli .= "Timezone: ".$info['timezone'].PHP_EOL;
-        $cli .= "Location: ".$info['loc'].PHP_EOL;
-        $cli .= "ISP: ".$info['isp'].PHP_EOL;
-        $cli .= "CIDR: ".$info['cidr'].PHP_EOL;
-        $cli .= "Detail: ".$info['detail'].PHP_EOL;
+        $cli = "IP: ".$info['ip'] . PHP_EOL;
+        $cli .= "AS: ".$info['as'] . PHP_EOL;
+        $cli .= "City: ".$info['city'] . PHP_EOL;
+        $cli .= "Region: ".$info['region'] . PHP_EOL;
+        $cli .= "Country: ".$info['country'] . PHP_EOL;
+        $cli .= "Timezone: ".$info['timezone'] . PHP_EOL;
+        $cli .= "Location: ".$info['loc'] . PHP_EOL;
+        $cli .= "ISP: ".$info['isp'] . PHP_EOL;
+        $cli .= "Scope: ".$info['scope'] . PHP_EOL;
+        $cli .= "Detail: ".$info['detail'] . PHP_EOL;
         return $cli;
     }
 
@@ -113,4 +113,13 @@ function getAS($rawIspInfo) { // 提取AS信息
     return trim($as['0']);
 }
 
+function tryCIDR($beginIP, $endIP) {
+    $tmp = ip2long($endIP) - ip2long($beginIP) + 1;
+    if (pow(2, intval(log($tmp, 2))) == $tmp) {
+        return $beginIP . '/' . (32 - log($tmp, 2));
+    } else {
+        return $beginIP . ' - ' . $endIP;
+    }
+}
+
 ?>
diff --git a/index.html b/index.html
index 61560e6..ab417b0 100644
--- a/index.html
+++ b/index.html
@@ -26,7 +26,7 @@
         $("#timezone").text(data.timezone);
         $("#loc").text(data.loc);
         $("#isp").text(data.isp);
-        $("#cidr").text(data.cidr);
+        $("#scope").text(data.scope);
         $("#detail").text(data.detail);
       });
     });
@@ -72,8 +72,8 @@
       <td id="isp"></td>
     </tr>
     <tr>
-      <td>CIDR</td>
-      <td id="cidr"></td>
+      <td>Scope</td>
+      <td id="scope"></td>
     </tr>
     <tr>
       <td>Detail</td>