diff --git a/config/net/c3d2.nix b/config/net/c3d2.nix
index e14330f..6b452a0 100644
--- a/config/net/c3d2.nix
+++ b/config/net/c3d2.nix
@@ -51,6 +51,7 @@
         "wiefelspuetz.hq.c3d2.de" = "aa:00:7f:01:8a:d0";
         "wormhole.hq.c3d2.de" = "00:23:c3:d2:00:76";
         "www1.hq.c3d2.de" = "aa:00:13:8b:03:47";
+        "riscbert.hq.c3d2.de" = "6c:cf:39:00:05:95";
       };
       time = 86400;
       max-time = 2592000;