diff --git a/ffhh.conf b/ffhh.conf
index 089bab8..31820b2 100644
--- a/ffhh.conf
+++ b/ffhh.conf
@@ -28,11 +28,11 @@ zone "ffhh.network" IN {
 zone "hamburg.freifunk.net" IN {
     type master;
     allow-transfer {
-    	81.7.15.101; # named.exosphere.de
-    	144.76.72.235; # ns.ohrensessel.net
+        91.121.91.1531; # named.exosphere.de
+        144.76.72.235; # ns.ohrensessel.net
     };
     also-notify {
-    	81.7.15.101; # named.exosphere.de
+        91.121.91.1531; # named.exosphere.de
         144.76.72.235; # ns.ohrensessel.net
     };
     file "/etc/bind/master/db.net.freifunk.hamburg";
@@ -52,11 +52,11 @@ zone "nodes.hamburg.freifunk.net" IN {
 zone "knotengraph.de" IN {
     type master;
     allow-transfer {
-    	81.7.15.101; # named.exosphere.de
-    	144.76.72.235; # ns.ohrensessel.net
+        91.121.91.1531; # named.exosphere.de
+        144.76.72.235; # ns.ohrensessel.net
     };
     also-notify {
-    	81.7.15.101; # named.exosphere.de
+        91.121.91.1531; # named.exosphere.de
         144.76.72.235; # ns.ohrensessel.net
     };
     file "/etc/bind/master/db.de.knotengraph";
@@ -65,11 +65,11 @@ zone "knotengraph.de" IN {
 zone "knotenkarte.de" IN {
     type master;
     allow-transfer {
-    	81.7.15.101; # named.exosphere.de
-    	144.76.72.235; # ns.ohrensessel.net
+        91.121.91.1531; # named.exosphere.de
+        144.76.72.235; # ns.ohrensessel.net
     };
     also-notify {
-    	81.7.15.101; # named.exosphere.de
+        91.121.91.1531; # named.exosphere.de
         144.76.72.235; # ns.ohrensessel.net
     };
     file "/etc/bind/master/db.de.knotenkarte";
@@ -106,11 +106,11 @@ zone "7.6.2.2.3.0.a.2.ip6.arpa" IN {
     type master;
     file "/etc/bind/master/db.arpa.ip6.2.a.0.3.2.2.6.7";
     allow-transfer {
-    	81.7.15.101; # named.exosphere.de
-    	144.76.72.235; # ns.ohrensessel.net
+        91.121.91.1531; # named.exosphere.de
+        144.76.72.235; # ns.ohrensessel.net
     };
     also-notify {
-    	81.7.15.101; # named.exosphere.de
+        91.121.91.1531; # named.exosphere.de
         144.76.72.235; # ns.ohrensessel.net
     };
     allow-update { key srv01-zone-key.; };
diff --git a/ffnord.conf b/ffnord.conf
index ffa3558..0693e0a 100644
--- a/ffnord.conf
+++ b/ffnord.conf
@@ -10,11 +10,11 @@ zone "ffnord" IN {
 zone "ffnord.net" IN {
     type master;
     allow-transfer {
-	    81.7.15.101; # named.exosphere.de
+	    91.121.91.1531; # named.exosphere.de
 	    144.76.72.235; # ns.ohrensessel.net
     };
     also-notify {
-	    81.7.15.101; # named.exosphere.de
+	    91.121.91.1531; # named.exosphere.de
        	    144.76.72.235; # ns.ohrensessel.net
     };
     file "/etc/bind/master/db.net.ffnord";
diff --git a/helgo.conf b/helgo.conf
index 112135d..55fea8f 100644
--- a/helgo.conf
+++ b/helgo.conf
@@ -9,11 +9,11 @@ zone "helgo" IN {
 zone "helgoland.freifunk.net" IN {
     type master;
     allow-transfer {
-	81.7.15.101; # named.exosphere.de
+	91.121.91.1531; # named.exosphere.de
 	144.76.72.235; # ns.ohrensessel.net
     };
     also-notify {
-	81.7.15.101; # named.exosphere.de
+	91.121.91.1531; # named.exosphere.de
         144.76.72.235; # ns.ohrensessel.net
     };
     file "/etc/bind/master/db.net.freifunk.helgoland";