diff --git a/netbox-scanner/config.py b/netbox-scanner/config.py
index 3824cad..060fe8e 100644
--- a/netbox-scanner/config.py
+++ b/netbox-scanner/config.py
@@ -3,6 +3,7 @@
 TAG = 'auto'
 UNKNOWN = 'UNKNOWN HOST'
 LOG = '.'  # path to logfile
+NMAP_ARGS = '-T4 -O -F --host-timeout 30s'
 
 NETBOX = {
     'ADDRESS': 'https://',
diff --git a/netbox-scanner/nbscan.py b/netbox-scanner/nbscan.py
index a8bbcf6..7b9d394 100644
--- a/netbox-scanner/nbscan.py
+++ b/netbox-scanner/nbscan.py
@@ -17,8 +17,9 @@ logging.getLogger('paramiko').setLevel(logging.CRITICAL)  # paramiko is noisy
 
 class NetBoxScanner(object):
     
-    def __init__(self, address, token, tls_verify, devs_auth, tag, unknown):
+    def __init__(self, address, token, tls_verify, nmap_args, devs_auth, tag, unknown):
         self.netbox = api(address, token=token, ssl_verify=tls_verify)
+        self.nmap_args = nmap_args
         self.devs = devs_auth
         self.tag = tag
         self.unknown = unknown
@@ -56,7 +57,7 @@ class NetBoxScanner(object):
         '''
         hosts = []
         nm = PortScanner()
-        nm.scan(network, arguments='-T4 -O -F')
+        nm.scan(network, arguments=self.nmap_args)
 
         for host in nm.all_hosts():
             address = nm[host]['addresses']['ipv4']
diff --git a/netbox-scanner/netbox-scanner.py b/netbox-scanner/netbox-scanner.py
index eb9d7ac..2316fdf 100644
--- a/netbox-scanner/netbox-scanner.py
+++ b/netbox-scanner/netbox-scanner.py
@@ -18,6 +18,8 @@ argp.add_argument('-t', '--token', help='netbox access token',
     default=config.NETBOX['TOKEN'])
 argp.add_argument('-v', '--verify', help='tls verify', 
     action='store_true', default=config.NETBOX['TLS_VERIFY'])
+argp.add_argument('-m', '--nmap', help='set Nmap arguments', 
+    default=config.NMAP_ARGS)
 argp.add_argument('-d', '--devices', help='device authentication crendentials',
     default=config.DEVICE_AUTH)
 argp.add_argument('-g', '--tag', help='netbox-scanner tag', 
@@ -35,8 +37,8 @@ logging.basicConfig(filename='{}/netbox-scanner-{}.log'.format(args.log,
 
 disable_warnings(InsecureRequestWarning)
 
-nbs = NetBoxScanner(args.address, args.token, args.verify, args.devices, 
-    args.tag, args.unknown)
+nbs = NetBoxScanner(args.address, args.token, args.verify, args.nmap, 
+    args.devices, args.tag, args.unknown)
 logging.info('started: {} networks'.format(len(args.networks)))
 stats = nbs.sync(args.networks)
 logging.info('finished: +{} ~{} -{} ?{} !{}'.format(stats[0], stats[1], 
diff --git a/setup.py b/setup.py
index 2031c32..d653607 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@ with open('README.md', 'r') as fh:
 
 setuptools.setup(
     name='netbox-scanner',
-    version='0.5.0',
+    version='0.5.1',
     author='José Lopes de Oliveira Jr.',
     author_email='jlojunior@gmail.com',
     description='A scanner util for NetBox',