diff --git a/build.py b/build.py
index 07e71dc..fc0f967 100755
--- a/build.py
+++ b/build.py
@@ -8,14 +8,16 @@ from requests.exceptions import RequestException, HTTPError
 
 import gfwlist
 
-
-SOURCES = {
+SOURCES_4 = {
     'ipdeny.com': 'http://www.ipdeny.com/ipblocks/data/aggregated/cn-aggregated.zone',
     '17mon': 'https://raw.githubusercontent.com/17mon/china_ip_list/master/china_ip_list.txt',
 }
-SOURCES2 = {
+SOURCES_6 = {
     'gaoyifan': 'https://gaoyifan.github.io/china-operator-ip/china6.txt',
 }
+SOURCES_46 = {
+    'maxmind': 'https://github.com/v2fly/geoip/raw/release/text/cn.txt',
+}
 OUT_DIR = "dist"
 
 # Stub content to disable GFWList check
@@ -28,6 +30,8 @@ def fetch_and_convert(src):
     template = "var CHINA = [\n{}\n];\n"
     lines = []
     for iprange in response.text.strip().split("\n"):
+        if iprange.find(":") != -1:
+            break
         ipnet = ipaddress.IPv4Network(iprange)
         netaddr = int(ipnet.network_address)
         netmask = int(ipnet.netmask)
@@ -57,6 +61,8 @@ def fetch_and_convert_ip6(src):
     fixlen = len(f"  [0xFFFFFFFF, -1, 0xFFFFFFFF],")
 
     for iprange in text.strip().split("\n"):
+        if iprange.find(":") == -1:
+            continue
         ipnet = ipaddress.IPv6Network(iprange)
         prefixlen = ipnet.prefixlen
         fulladdr = str(ipnet.exploded).replace(':', '')
@@ -131,34 +137,62 @@ def main():
     gfwlist_stub = GFWLIST_STUB
 
     os.makedirs(OUT_DIR, mode=0o755, exist_ok=True)
-    for key in SOURCES:
-        print(f"Generating PAC script from source {key}")
+    for key in SOURCES_4:
+        key_6 = list(SOURCES_6)[0]
+        print(f"Generating PAC script from source {key}(IPv4) & {key_6}(IPv6)")
         try:
-            data = fetch_and_convert(SOURCES[key])
-            key2 = list(SOURCES2)[0]
-            data2 = fetch_and_convert_ip6(SOURCES2[key2])
+            data = fetch_and_convert(SOURCES_4[key])
+            data_6 = fetch_and_convert_ip6(SOURCES_6[key_6])
         except RequestException:
             continue
         except HTTPError:
             continue
 
-        filename = f"pac-{key}-{key2}.txt"
-        filename_gfwlist = f"pac-gfwlist-{key}-{key2}.txt"
+        filename = f"pac-IPv4_{key}--IPv6_{key_6}.txt"
+        filename_gfwlist = f"pac-gfwlist-IPv4_{key}--IPv6_{key_6}.txt"
         with open(os.path.join(OUT_DIR, filename), "w") as f:
             f.write(code)
             f.write(data)
             f.write("\n")
-            f.write(data2)
+            f.write(data_6)
             f.write("\n")
             f.write(gfwlist_stub)
         with open(os.path.join(OUT_DIR, filename_gfwlist), "w") as f:
             f.write(code)
             f.write(data)
             f.write("\n")
-            f.write(data2)
+            f.write(data_6)
+            f.write("\n")
+            f.write(gfwlist_part)
+
+    for key in SOURCES_46:
+        print(f"Generating PAC script from source {key}(IPv4v6)")
+        try:
+            data = fetch_and_convert(SOURCES_46[key])
+            data_6 = fetch_and_convert_ip6(SOURCES_46[key])
+        except RequestException:
+            continue
+        except HTTPError:
+            continue
+
+        filename = f"pac-IPv4v6_{key}.txt"
+        filename_gfwlist = f"pac-gfwlist-IPv4v6_{key}.txt"
+        with open(os.path.join(OUT_DIR, filename), "w") as f:
+            f.write(code)
+            f.write(data)
+            f.write("\n")
+            f.write(data_6)
+            f.write("\n")
+            f.write(gfwlist_stub)
+        with open(os.path.join(OUT_DIR, filename_gfwlist), "w") as f:
+            f.write(code)
+            f.write(data)
+            f.write("\n")
+            f.write(data_6)
             f.write("\n")
             f.write(gfwlist_part)
 
 
+
 if __name__ == '__main__':
     main()
diff --git a/code.js b/code.js
index 452761b..66f1d57 100644
--- a/code.js
+++ b/code.js
@@ -19,14 +19,14 @@ function binarySearch(list, num, lower, upper) {
   return x;
 }
 
-function convertToInt6(high, low) {
+function convertToUInt6(high, low) {
   var num1 = parseInt(high, 16) & 0xFFFF;
   var num2 = parseInt(low, 16) & 0xFFFF;
   return (((num1 << 16) | num2) >>> 0);
 }
 
 function isInNet6(parts, list, list2) {
-  var num = convertToInt6(parts[0], parts[1]);
+  var num = convertToUInt6(parts[0], parts[1]);
   var x = binarySearch(list, num, 0, list.length);
   
   if (list[x][1] == -1) 
@@ -36,7 +36,7 @@ function isInNet6(parts, list, list2) {
   if (num !== list[x][0]) 
     return false;
   
-  var num2 = convertToInt6(parts[2], parts[3]);
+  var num2 = convertToUInt6(parts[2], parts[3]);
   var x2 = binarySearch(list2, num2, list[x][1], list[x][2] + 1);
   
   return (((num2 & list2[x2][1]) ^ list2[x2][0]) === 0);
@@ -91,14 +91,14 @@ function isLanOrChina6(host) {
   return isInNet6(parts, CHINA6_F, CHINA6_S) || isInNet6(parts, LAN6_F, LAN6_S);
 }
 
-function convertToInt(host) {
+function convertToUInt(host) {
   var bytes = host.split(".");
   var result = ((bytes[0] & 0xFF) << 24) | ((bytes[1] & 0xFF) << 16) | ((bytes[2] & 0xFF) <<  8) | (bytes[3] & 0xFF);
   return (result >>> 0);
 }
 
 function belongsToSubnet(host, list) {
-  var ip = convertToInt(host);
+  var ip = convertToUInt(host);
 
   if (list.length === 0 || ip < list[0][0])
     return false;