diff --git a/include/Host.h b/include/Host.h
index 01ee979eca..428bfc3389 100644
--- a/include/Host.h
+++ b/include/Host.h
@@ -30,7 +30,7 @@ class Host : public GenericHashEntry, public HostAlertableEntity, public Score,
  protected:
   IpAddress ip;
   Mac *mac;
-  char *asname;
+  char *asname, *blacklist_name;
 
   struct {
     Fingerprint ja3;
@@ -590,6 +590,7 @@ class Host : public GenericHashEntry, public HostAlertableEntity, public Score,
   }
 
   inline HostStats* getStats() { return(stats); }
+  void setBlacklistName(char*);
 };
 
 #endif /* _HOST_H_ */
diff --git a/scripts/lua/host_details.lua b/scripts/lua/host_details.lua
index 4e804aa091..2e24290ce0 100644
--- a/scripts/lua/host_details.lua
+++ b/scripts/lua/host_details.lua
@@ -653,7 +653,14 @@ else
 
          if(host["dhcp_server"] == true) then print(' <span class="badge bg-success" style="cursor: help;">'..i18n("details.label_dhcp_server")..'</span>') end
          if(host["systemhost"] == true) then print(' <span class="badge bg-success" style="cursor: help;"><i class=\"fas fa-flag\" title=\"'..i18n("details.label_system_ip")..'\"></i></span>') end
-         if(host["is_blacklisted"] == true) then print(' <span class="badge bg-danger" style="cursor: help;">'..i18n("details.label_blacklisted_host")..'</span>') end
+         if(host["is_blacklisted"] == true) then
+	    print(' <span class="badge bg-danger" style="cursor: help;">'..i18n("details.label_blacklisted_host"))
+
+	    if(host.blacklist_name ~= nil) then print(' ('.. host.blacklist_name ..')') end
+
+	    print('</span>')
+	 end
+	 
          if((host["privatehost"] == false) and (host["is_multicast"] == false) and (host["is_broadcast"] == false)) then
                print(' <A class="ntopng-external-link" href="https://www.virustotal.com/gui/ip-address/'.. host["ip"] ..'/detection" target=_blank><small>VirusTotal</small> <i class=\"fas fa-external-link-alt\"></i></A>')
                print(' <A class="ntopng-external-link" href="https://www.greynoise.io/viz/ip/'.. host["ip"] ..'" target=_blank><small>GreyNoise</small> <i class=\"fas fa-external-link-alt\"></i></A>')
diff --git a/src/Flow.cpp b/src/Flow.cpp
index e0fafa9c57..9ce4f31dd0 100644
--- a/src/Flow.cpp
+++ b/src/Flow.cpp
@@ -139,7 +139,9 @@ Flow::Flow(NetworkInterface *_iface,
 	lh->setRouterMac(_srv_mac);
       }
     }
-  } else { /* Client host has not been allocated, let's keep the info in an IpAddress */
+  } else {
+    /* Client host has not been allocated, let's keep the info in an IpAddress */
+    
     if((cli_ip_addr = new (std::nothrow) IpAddress(*_cli_ip)))
       cli_ip_addr->reloadBlacklist(iface->get_ndpi_struct());
   }
@@ -158,7 +160,9 @@ Flow::Flow(NetworkInterface *_iface,
       cli_host->get_country(country, sizeof(country));
       if(country[0] != '\0') srv_host->incCountriesContacts(country);
     }
-  } else { /* Server host has not been allocated, let's keep the info in an IpAddress */
+  } else {
+    /* Server host has not been allocated, let's keep the info in an IpAddress */
+    
     if((srv_ip_addr = new (std::nothrow) IpAddress(*_srv_ip)))
       srv_ip_addr->reloadBlacklist(iface->get_ndpi_struct());
   }
@@ -169,7 +173,9 @@ Flow::Flow(NetworkInterface *_iface,
      && get_cli_ip_addr()->isIPv4()
      && get_srv_ip_addr()->isIPv4() /* IPv4 only */
      && !get_srv_ip_addr()->isBroadcastAddress() /* Avoid 255.255.255.255 */)
-    getInterface()->updateBroadcastDomains(_vlanId, _cli_mac->get_mac(), _srv_mac->get_mac(), ntohl(_cli_ip->get_ipv4()), ntohl(_srv_ip->get_ipv4()));
+    getInterface()->updateBroadcastDomains(_vlanId, _cli_mac->get_mac(),
+					   _srv_mac->get_mac(), ntohl(_cli_ip->get_ipv4()),
+					   ntohl(_srv_ip->get_ipv4()));
 
   memset(&custom_app, 0, sizeof(custom_app));
 
@@ -180,7 +186,8 @@ Flow::Flow(NetworkInterface *_iface,
 
   if(hp) {
     if(cli_host) routing_table_id = hp->getRoutingPolicy(cli_host->get_host_pool());
-    if(srv_host) routing_table_id = max_val(routing_table_id, hp->getRoutingPolicy(srv_host->get_host_pool()));
+    if(srv_host) routing_table_id = max_val(routing_table_id,
+					    hp->getRoutingPolicy(srv_host->get_host_pool()));
   }
 #endif
 
@@ -267,8 +274,10 @@ Flow::Flow(NetworkInterface *_iface,
 
   if(isBlacklistedClient()) {
     if(srv_host) srv_host->inc_num_blacklisted_flows(false);
+    cli_host->setBlacklistName((char*)get_custom_category_file());
   } else if(isBlacklistedServer()) {
     if(cli_host) cli_host->inc_num_blacklisted_flows(true);
+    srv_host->setBlacklistName((char*)get_custom_category_file());
   }
 
   iface->execFlowBeginChecks(this);
@@ -865,9 +874,18 @@ void Flow::processPacket(const struct pcap_pkthdr *h,
 			  payload, payload_len,
 			  (struct timeval *)&h->ts);
 
-  if(detection_completed && (!needsExtraDissection())) {
-    setExtraDissectionCompleted();
-    updateProtocol(proto_id);
+  if(detection_completed) {
+    if(!needsExtraDissection()) {
+      setExtraDissectionCompleted();
+      updateProtocol(proto_id);
+    }
+
+    if(get_custom_category_file()) {
+      if(isBlacklistedClient())
+	cli_host->setBlacklistName((char*)get_custom_category_file());
+      else if(isBlacklistedServer())
+	srv_host->setBlacklistName((char*)get_custom_category_file());
+    }
   }
 }
 
diff --git a/src/Host.cpp b/src/Host.cpp
index 65ad739c48..852fcb1559 100644
--- a/src/Host.cpp
+++ b/src/Host.cpp
@@ -91,6 +91,8 @@ Host::~Host() {
   if(listening_ports)             delete listening_ports;
   if(listening_ports_shadow)      delete listening_ports_shadow;
 #endif
+
+  if(blacklist_name)              free(blacklist_name);
   
   /*
     Pool counters are updated both in and outside the datapath.
@@ -291,6 +293,7 @@ void Host::initialize(Mac *_mac, VLANid _vlanId, u_int16_t observation_point_id)
   is_in_broadcast_domain = iface->isLocalBroadcastDomainHost(this, true /* Inline call */);
 
   memset(&num_blacklisted_flows, 0, sizeof(num_blacklisted_flows));
+  blacklist_name = NULL;
 }
 
 /* *************************************** */
@@ -816,6 +819,9 @@ void Host::lua(lua_State* vm, AddressTree *ptree,
   if(device_ip != 0)
     lua_push_str_table_entry(vm, "device_ip", Utils::intoaV4(device_ip, buf, sizeof(buf)));
 
+  if(blacklist_name != NULL)
+    lua_push_str_table_entry(vm, "blacklist_name", blacklist_name);
+  
   if(more_then_one_device)
     lua_push_bool_table_entry(vm, "more_then_one_device", more_then_one_device);
 
@@ -2380,3 +2386,9 @@ void Host::setPopServer(char *name) {
   }
 }
 
+/* *************************************** */
+
+void Host::setBlacklistName(char *name) {
+  if((blacklist_name == NULL) && (name != NULL))
+    blacklist_name = strdup(name);
+}