diff --git a/.gitignore b/.gitignore
index 53ae117..857c6ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 .idea/
-report/*.html
\ No newline at end of file
+report/*.html
+*.pyc
\ No newline at end of file
diff --git a/1.txt b/1.txt
deleted file mode 100644
index c83880f..0000000
--- a/1.txt
+++ /dev/null
@@ -1,87 +0,0 @@
-mail.rajax.me
-pop.rajax.me
-smtp.rajax.me
-imap.rajax.me
-email.rajax.me
-portal.rajax.me
-crm.rajax.me
-sso.rajax.me
-ads.rajax.me
-im.rajax.me
-mdm.rajax.me
-pms.rajax.me
-voip.rajax.me
-act.rajax.me
-int.rajax.me
-pan.rajax.me
-tl.rajax.me
-fast.rajax.me
-tss.rajax.me
-visit.rajax.me
-ehr.rajax.me
-imt.rajax.me
-prm.rajax.me
-tos.rajax.me
-wim.rajax.me
-itsm.rajax.me
-workflow.rajax.me
-zc.ele.me
-www.ele.me
-venus.ele.me
-v5.ele.me
-v.ele.me
-static2.ele.me
-static.ele.me
-sso.ele.me
-smtp.ele.me
-sms.ele.me
-sip.ele.me
-shop.ele.me
-security.ele.me
-sales.ele.me
-s.ele.me
-r.ele.me
-pop.ele.me
-ping.ele.me
-pay.ele.me
-pandora.ele.me
-p.ele.me
-openapi.ele.me
-oauth.ele.me
-mx2.ele.me
-mx1.ele.me
-mir.ele.me
-mars.ele.me
-marketing.ele.me
-mail.ele.me
-m.ele.me
-lyncdiscover.ele.me
-jobs.ele.me
-imap.ele.me
-huodong.ele.me
-h5.ele.me
-h.ele.me
-grand.ele.me
-games.ele.me
-fe.ele.me
-fbs.ele.me
-fast.ele.me
-family.ele.me
-es.ele.me
-email.ele.me
-em.ele.me
-ehr.ele.me
-ef.ele.me
-echo.ele.me
-ea.ele.me
-download.ele.me
-docs.ele.me
-dl.ele.me
-coco.ele.me
-bam.ele.me
-autodiscover.ele.me
-apollo.ele.me
-api.ele.me
-activity.ele.me
-account.ele.me
-18.ele.me
diff --git a/LNScan.py b/LNScan.py
index d2bcbe2..74c923d 100644
--- a/LNScan.py
+++ b/LNScan.py
@@ -29,6 +29,7 @@ def parse_args():
     parser.add_argument('--ip', type=str, help='ip addresses like 192.168.1.1/24')
     parser.add_argument('--port', type=str, default='', help='user single quotes to split the ports,\
                                           like 80,21, default 8 ports')
+    parser.add_argument('--extend', type=str, default='', help='extend the given ips by ip masks ,such as "30"')
     if len(sys.argv) == 1:
         sys.argv.append('-h')
     _args = parser.parse_args()
@@ -136,12 +137,43 @@ def scan(url, s_results, _ports, _lock):
         s_results.put((_results, _hosts))
 
 
+def ip_into_int(ip):
+    # (((((192 * 256) + 168) * 256) + 1) * 256) + 13
+    return reduce(lambda x, y: (x << 8)+y, map(int, ip.split('.')))
+
+
+def is_internal_ip(ip):
+    if ip == '127.0.0.1':
+        return True
+    ip = ip_into_int(ip)
+    net_a = ip_into_int('10.255.255.255') >> 24
+    net_b = ip_into_int('172.31.255.255') >> 20
+    net_c = ip_into_int('192.168.255.255') >> 16
+    return ip >> 24 == net_a or ip >> 20 == net_b or ip >> 16 == net_c
+
+
+def ip_extend(ini_list, extend):
+    print "domains are been extended..."
+    extend_all_ips = []
+    for _domain in ini_list:
+        ip = socket.gethostbyname(_domain)
+        if is_internal_ip(ip):
+            continue
+        __ip = ip+"/"+extend
+        extend_ips = ip_parse(__ip)
+        extend_all_ips += extend_ips
+    extend_last_ips = list(set(ini_list + extend_all_ips))
+    return extend_last_ips
+
+
 if __name__ == '__main__':
     args = parse_args()
     if args.ip:
         ip_lists = ip_parse(args.ip)
     else:
         ip_lists = ip_revive(args.f)
+        if args.extend:
+            ip_lists = ip_extend(ip_lists, args.extend)
     ports = args.port
     if ports:
         ports = ports.split(',')
@@ -157,7 +189,6 @@ def scan(url, s_results, _ports, _lock):
         s_results, s_hosts = ip_Queue.get()
         ip_info = dict(ip_info, **s_results)
         next_ips += s_hosts
-
     q_results = multiprocessing.Manager().Queue()   # start BBScan
     lock = multiprocessing.Manager().Lock()
     pool = multiprocessing.Pool(10)
diff --git a/README.md b/README.md
index 081b4d9..5223a50 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ LNScan(Local Network Scanner)，作为一个内部网络扫描器，仅是为了
 - 支持指定ip段，或者文件导入（ip/域名）
 - 敏感文件扫描支持多web端口
 - 扫描结束后生成格式鲜明的html报告，方便查看
+- 支持自定义扩展每个导入ip/doamin，如"--extentd 30"，则扩展成4个
 
 #### Usage
 
@@ -17,11 +18,12 @@ A WebScanner to scan local network.
 By wps2015(http://wps2015.org)
 
 optional arguments:
-  -h, --help   show this help message and exit
-  -v           show program's version number and exit
-  -f F         import the file of ip/domain list
-  --ip IP      ip addresses like 192.168.1.1/24
-  --port PORT  user single quotes to split the ports,like 80,21, default 8 ports
+  -h, --help       show this help message and exit
+  -v               show program's version number and exit
+  -f F             import the file of ip/domain list
+  --ip IP          ip addresses like 192.168.1.1/24
+  --port PORT      user single quotes to split the ports, like 80,21, default 8 ports
+  --extend EXTEND  extend the given ips by ip masks ,such as "30"
 ```
 #### Other
 if you have any bug , please remind me in the Issues.