Remove extra function since no need (nmap after all has an option to force always DNS resolution)

nbs/nmap.py

@@ -1,8 +1,5 @@
-import socket
-
 import nmap3
 
-
 class Nmap(object):
 
     def __init__(self, unknown, networks):
@@ -14,27 +11,14 @@ class Nmap(object):
     def scan(self):
         nmap = nmap3.NmapHostDiscovery()  # instantiate nmap object
         for item in self.networks:
-            temp_scan_result = nmap.nmap_no_portscan(item.replace('\n', ''))
+            temp_scan_result = nmap.nmap_no_portscan(item.replace('\n', ''), args="-R --system-dns")
             self.scan_results = {**self.scan_results, **temp_scan_result}
             self.scan_results.pop("stats")
             self.scan_results.pop("runtime")
         return self.scan_results
 
-    def dns_resolution(self):
-        # Try to improve DNS resolution since NMAP is not consistent
-        for ip, v in self.scan_results.items():
-            try:
-                name, arpa, ip = socket.gethostbyaddr(ip)
-                try:
-                    v["hostname"][0]["name"]
-                except (TypeError, IndexError):
-                    v.update({"hostname": {"name": name, "type": 'PTR'}})
-            except socket.herror:
-                pass
-
     def run(self):
         self.scan()
-        self.dns_resolution()
         for k,v in self.scan().items():
             try:
                 self.hosts.append((