diff --git a/lib/mentat/module/netmngr.py b/lib/mentat/module/netmngr.py
index 04af416fd3b5dde031c7dcc2becb08d01fcc7fa0..a919e9822cd6cdecc186ea460fc11afa96d300dc 100644
--- a/lib/mentat/module/netmngr.py
+++ b/lib/mentat/module/netmngr.py
@@ -382,7 +382,7 @@ class MentatNetmngrScript(mentat.script.fetcher.FetcherScript):
         self._check_emails(abuse_group_dict, wi_file_data)
         self._groups_create_missing(abuse_group_dict, wi_file_data, wi_file_type, result, status_only)
         self._groups_remove_extra(abuse_group_dict, wi_file_data, wi_file_type, result, status_only)
-        self._groups_update_existing(abuse_group_dict, wi_file_data, result, status_only)
+        self._groups_update_existing(abuse_group_dict, wi_file_data, wi_file_type, result, status_only)
 
         return result
 
@@ -558,13 +558,14 @@ class MentatNetmngrScript(mentat.script.fetcher.FetcherScript):
                     result['delete'][gkey].append(nkey)
                     self.logger.warning("'%s' Network '%s' was not found in loaded whois file, consider deletion.", gkey, nkey)
 
-    def _groups_update_existing(self, abuse_group_dict, wi_file_data, result, status_only):
+    def _groups_update_existing(self, abuse_group_dict, wi_file_data, wi_file_type, result, status_only):
         """
         Update existing abuse groups and their appropriate whois records within
         the database.
 
         :param dict abuse_group_dict: Abuse groups and network records loaded from database.
         :param dict wi_file_data: Abuse groups and network records loaded from reference whois file.
+        :param str wi_file_type: Value of ``__whois_type__`` meta attribute from reference whois file.
         :param dict result: Structure containing processing log, will be appended to script runlog.
         :param bool status_only: Do not actually perform any database operations, just report status.
         """
@@ -576,16 +577,18 @@ class MentatNetmngrScript(mentat.script.fetcher.FetcherScript):
                 self._group_update_networks(
                     abuse_group_dict[group_name],
                     [network for networks in wi_file_data[name].values() for network in networks],
+                    wi_file_type,
                     result,
                     status_only)
                 self.sqlservice.session.commit()
 
-    def _group_update_networks(self, group, networks, result, status_only):
+    def _group_update_networks(self, group, networks, wi_file_type, result, status_only):
         """
         Update abuse group network list coming from given source.
 
         :param mentat.datatype.sqldb.GroupModel group: Abuse group to be processed.
         :param list networks: List of network records loaded from reference whois file.
+        :param str wi_file_type: Value of ``__whois_type__`` meta attribute from reference whois file.
         :param dict result: Structure containing processing log, will be appended to script runlog.
         :param bool status_only: Do not actually perform any database operations, just report status.
         """
@@ -627,7 +630,7 @@ class MentatNetmngrScript(mentat.script.fetcher.FetcherScript):
                 group.networks[index].is_base = net['is_base']
 
         for net in group.networks:
-            if not self._is_network_in(net, networks):
+            if not self._is_network_in(net, networks) and wi_file_type in net.source:
                 nkey = '{}::{}'.format(net.network, net.source)
                 result['delete'].setdefault(gkey, []).append(nkey)
                 if status_only: