diff --git a/src/net/acceptor.rs b/src/net/acceptor.rs
index 17a679330..0be7a2c7f 100644
--- a/src/net/acceptor.rs
+++ b/src/net/acceptor.rs
@@ -126,7 +126,8 @@ impl Acceptor {
                         .hosts()
                         .container
                         .contains(HostColor::Black as usize, &url)
-                        .await
+                        .await ||
+                        self.session.upgrade().unwrap().p2p().settings().blacklist.contains(&url)
                     {
                         warn!(target: "net::acceptor::run_accept_loop()", "Peer {} is blacklisted", url);
                         continue
diff --git a/src/net/connector.rs b/src/net/connector.rs
index 3c95a9dd6..7f5ad8206 100644
--- a/src/net/connector.rs
+++ b/src/net/connector.rs
@@ -54,7 +54,8 @@ impl Connector {
             .hosts()
             .container
             .contains(HostColor::Black as usize, url)
-            .await
+            .await ||
+            self.session.upgrade().unwrap().p2p().settings().blacklist.contains(url)
         {
             warn!(target: "net::connector::connect", "Peer {} is blacklisted", url);
             return Err(Error::ConnectFailed)
diff --git a/src/net/hosts.rs b/src/net/hosts.rs
index 7b83ea4d5..46d68d500 100644
--- a/src/net/hosts.rs
+++ b/src/net/hosts.rs
@@ -303,7 +303,9 @@ impl HostContainer {
         HostColor::try_from(color).unwrap());
 
         let mut list = self.hostlists[color].write().await;
-        list.push((addr, last_seen));
+        list.push((addr.clone(), last_seen));
+        debug!(target: "net::hosts::store()", "Added [{}] to {:?} list",
+        addr, HostColor::try_from(color).unwrap());
 
         if color == 0 && list.len() == GREYLIST_MAX_LEN {
             let last_entry = list.pop().unwrap();
@@ -928,7 +930,6 @@ impl Hosts {
     /// process fails, or when a channel stops. Prevents hosts from getting trapped in the
     /// HostState logical machinery.
     pub async fn unregister(&self, addr: &Url) {
-        debug!(target: "net::hosts::unregister()", "Removing {} from HostRegistry", addr);
         self.registry.write().await.remove(addr);
         debug!(target: "net::hosts::unregister()", "Removed {} from HostRegistry", addr);
     }
@@ -1069,7 +1070,9 @@ impl Hosts {
             }
 
             // Blacklist peers should never enter the hostlist.
-            if self.container.contains(HostColor::Black as usize, addr_).await {
+            if self.container.contains(HostColor::Black as usize, addr_).await ||
+                settings.blacklist.contains(addr_)
+            {
                 warn!(target: "net::hosts::filter_addresses()",
                 "[{}] is blacklisted", addr_);
                 continue
@@ -1140,8 +1143,6 @@ impl Hosts {
             if !settings.allowed_transports.contains(&addr_.scheme().to_string()) {
                 self.container.store_or_update(HostColor::Dark, addr_.clone(), *last_seen).await;
 
-                debug!(target: "net::hosts::filter_addresses()",
-                    "Added unsupported peer {} to Dark list", addr_);
                 continue
             }
 
@@ -1152,8 +1153,7 @@ impl Hosts {
                 self.container.contains(HostColor::White as usize, addr_).await ||
                 self.container.contains(HostColor::Grey as usize, addr_).await
             {
-                debug!(target: "net::hosts::filter_addresses()",
-                    "We already have {} in the hostlist. Skipping", addr_);
+                debug!(target: "net::hosts::filter_addresses()", "[{}] exists! Skipping", addr_);
                 continue
             }
 
diff --git a/src/net/settings.rs b/src/net/settings.rs
index f2275e450..bb88a1a1d 100644
--- a/src/net/settings.rs
+++ b/src/net/settings.rs
@@ -77,6 +77,8 @@ pub struct Settings {
     /// Number of seconds with no connections after which refinery
     /// process is paused.
     pub time_with_no_connections: u64,
+    /// Nodes to avoid interacting with for the duration of the program.
+    pub blacklist: Vec<Url>,
 }
 
 impl Default for Settings {
@@ -107,6 +109,7 @@ impl Default for Settings {
             white_connect_count: 90,
             anchor_connect_count: 2,
             time_with_no_connections: 30,
+            blacklist: vec![],
         }
     }
 }
@@ -213,6 +216,11 @@ pub struct SettingsOpt {
     /// process is paused.
     #[structopt(skip)]
     pub time_with_no_connections: Option<u64>,
+
+    /// Nodes to avoid interacting with for the duration of the program.
+    #[serde(default)]
+    #[structopt(long)]
+    pub blacklist: Vec<Url>,
 }
 
 impl From<SettingsOpt> for Settings {
@@ -256,6 +264,7 @@ impl From<SettingsOpt> for Settings {
             time_with_no_connections: opt
                 .time_with_no_connections
                 .unwrap_or(def.time_with_no_connections),
+            blacklist: opt.blacklist,
         }
     }
 }