diff --git a/contrib/seeds/makeseeds.py b/contrib/seeds/makeseeds.py
--- a/contrib/seeds/makeseeds.py
+++ b/contrib/seeds/makeseeds.py
@@ -15,7 +15,7 @@
 # These are hosts that have been observed to be behaving strangely (e.g.
 # aggressively connecting to every node).
 SUSPICIOUS_HOSTS = {
-    "130.211.129.106", "178.63.107.226",
+    "23.92.36.9", "72.36.89.11", "130.211.129.106", "178.63.107.226",
     "83.81.130.26", "88.198.17.7", "148.251.238.178", "176.9.46.6",
     "54.173.72.127", "54.174.10.182", "54.183.64.54", "54.194.231.211",
     "54.66.214.167", "54.66.220.137", "54.67.33.14", "54.77.251.214",
diff --git a/doc/release-notes.md b/doc/release-notes.md
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -6,3 +6,4 @@
  - Add monolithactivationtime configuration in order to chose when the May, 15 hard fork activates. This value should not be changed in production, but it allows user to test the fork activation ahead of time.
  - `dumpwallet` no longer allows overwriting files. This is a security measure
    as well as prevents dangerous user mistakes.
+ - Node using the wrong magic are now getting banned.
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -3125,6 +3125,10 @@
                CMessageHeader::MESSAGE_START_SIZE) != 0) {
         LogPrintf("PROCESSMESSAGE: INVALID MESSAGESTART %s peer=%d\n",
                   SanitizeString(msg.hdr.GetCommand()), pfrom->id);
+
+        // Make sure we ban where that come from for some time.
+        connman.Ban(pfrom->addr, BanReasonNodeMisbehaving);
+
         pfrom->fDisconnect = true;
         return false;
     }