diff --git a/theHarvester/__main__.py b/theHarvester/__main__.py
index c3a319fa..4c4adf65 100644
--- a/theHarvester/__main__.py
+++ b/theHarvester/__main__.py
@@ -484,7 +484,6 @@ async def handler(lst):
             if not analyzed_ranges.count(ip_range):
                 print('[*] Performing reverse lookup in ' + ip_range)
                 a = dnssearch.DnsReverse(ip_range, True)
-                a.list()
                 res = a.process()
                 analyzed_ranges.append(ip_range)
             else:
diff --git a/theHarvester/discovery/dnssearch.py b/theHarvester/discovery/dnssearch.py
index f3d5bd07..0ab624a2 100644
--- a/theHarvester/discovery/dnssearch.py
+++ b/theHarvester/discovery/dnssearch.py
@@ -2,6 +2,8 @@
 import dns.resolver
 import dns.reversename
 
+from typing import List
+
 # TODO: need big focus on performance and results parsing, now does the basic.
 
 
@@ -69,22 +71,22 @@ def __init__(
         self.iprange = iprange
         self.verbose = verbose
 
-    def list(
-            self) -> list:
+    def _list_ips_in_range(
+            self) -> List[str]:
         """
         List all the IPs in the range.
-        They are stored in self.list.
 
         Parameters
         ----------
 
         Returns
         -------
-        out: None.
+        out: list.
+            The list of IPs in the range.
         """
         prefix = '.'.join(
             self.iprange.split('.')[:-1])
-        self.list = [prefix + '.' + str(i) for i in range(256)]
+        return [prefix + '.' + str(i) for i in range(256)]
 
     def run(
             self,
@@ -118,7 +120,7 @@ def run(
             pass
 
     def process(
-            self) -> list:
+            self) -> List[str]:
         """
         Reverse all the IPs stored in 'self.list'.
 
@@ -131,7 +133,7 @@ def process(
             The list of all the found CNAME records.
         """
         results = []
-        for entry in self.list:
+        for entry in self._list_ips_in_range():
             host = self.run(entry)
             if host is not None:
                 # print(' : ' + host.split(':')[1])