diff --git a/domains/ffmuc_freising.conf b/domains/ffmuc_freising.conf
index 6d1563ef..7b7ee568 100644
--- a/domains/ffmuc_freising.conf
+++ b/domains/ffmuc_freising.conf
@@ -6,7 +6,7 @@
   domain_seed = 'e50c53517f25160c134711e4e39a0240d3cf4f4b0adfd950ac232bad2c5c264b',
 
   prefix4 = '10.80.216.0/21',
-  prefix6 = 'fc00:10b::/64',
+  prefix6 = 'fd00:10b::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:10b::/64',
diff --git a/domains/ffmuc_gauting.conf b/domains/ffmuc_gauting.conf
index 97070dd2..eef81727 100644
--- a/domains/ffmuc_gauting.conf
+++ b/domains/ffmuc_gauting.conf
@@ -6,7 +6,7 @@
   domain_seed = 'ae63f3daf9326f3b267b941caf790b2d20eadeacf9ef46d9ca53d7495f559db0',
 
   prefix4 = '10.80.208.0/21',
-  prefix6 = 'fc00:10a::/64',
+  prefix6 = 'fd00:10a::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:10a::/64',
diff --git a/domains/ffmuc_muc_cty.conf b/domains/ffmuc_muc_cty.conf
index da407ea4..2f098a9e 100644
--- a/domains/ffmuc_muc_cty.conf
+++ b/domains/ffmuc_muc_cty.conf
@@ -6,7 +6,7 @@
   domain_seed = 'a2e8fb0dfb713f6020b893f1c505cee46abb0e63928e8ff1c1fbe3377f56e150',
 
   prefix4 = '10.80.128.0/21',
-  prefix6 = 'fc00:100::/64',
+  prefix6 = 'fd00:100::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:100::/64',
diff --git a/domains/ffmuc_muc_nord.conf b/domains/ffmuc_muc_nord.conf
index ce62537f..7ac71082 100644
--- a/domains/ffmuc_muc_nord.conf
+++ b/domains/ffmuc_muc_nord.conf
@@ -6,7 +6,7 @@
   domain_seed = 'ef2c3c3336025a4cb3076a61b112a59a042781c7ce3359d96102d197b99ac89b',
 
   prefix4 = '10.80.136.0/21',
-  prefix6 = 'fc00:101::/64',
+  prefix6 = 'fd00:101::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:101::/64',
diff --git a/domains/ffmuc_muc_ost.conf b/domains/ffmuc_muc_ost.conf
index cfdcde4b..1f067a98 100644
--- a/domains/ffmuc_muc_ost.conf
+++ b/domains/ffmuc_muc_ost.conf
@@ -6,7 +6,7 @@
   domain_seed = '4d57658aaf4428149771a5decfa5d6b7d8b129e3915ebcd5d7329400a6dd48ff',
 
   prefix4 = '10.80.144.0/21',
-  prefix6 = 'fc00:102::/64',
+  prefix6 = 'fd00:102::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:102::/64',
diff --git a/domains/ffmuc_muc_sued.conf b/domains/ffmuc_muc_sued.conf
index c6c4acb6..53c33066 100644
--- a/domains/ffmuc_muc_sued.conf
+++ b/domains/ffmuc_muc_sued.conf
@@ -6,7 +6,7 @@
   domain_seed = '2461d70aa0453a1fc17131d6eb7ba3a60560d94b376d3039bd6c28a961cfa5e2',
 
   prefix4 = '10.80.152.0/21',
-  prefix6 = 'fc00:103::/64',
+  prefix6 = 'fd00:103::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:103::/64',
diff --git a/domains/ffmuc_muc_west.conf b/domains/ffmuc_muc_west.conf
index 4c7a7bc6..bad6e110 100644
--- a/domains/ffmuc_muc_west.conf
+++ b/domains/ffmuc_muc_west.conf
@@ -6,7 +6,7 @@
   domain_seed = '4daea463c2c73009c9dffdd70282ccf5b36407e5179875beae66a5dc823eabe8',
 
   prefix4 = '10.80.160.0/21',
-  prefix6 = 'fc00:104::/64',
+  prefix6 = 'fd00:104::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:104::/64',
diff --git a/domains/ffmuc_uml_nord.conf b/domains/ffmuc_uml_nord.conf
index 9c00b2f8..0e60d7a8 100644
--- a/domains/ffmuc_uml_nord.conf
+++ b/domains/ffmuc_uml_nord.conf
@@ -6,7 +6,7 @@
   domain_seed = 'd4fe53ea5eb7d57cecb69b4be43b2eac760e18f10f2f26ff3db801c3b90ea650',
 
   prefix4 = '10.80.168.0/21',
-  prefix6 = 'fc00:105::/64',
+  prefix6 = 'fd00:105::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:105::/64',
diff --git a/domains/ffmuc_uml_ost.conf b/domains/ffmuc_uml_ost.conf
index c22e7c27..6f2c3e31 100644
--- a/domains/ffmuc_uml_ost.conf
+++ b/domains/ffmuc_uml_ost.conf
@@ -6,7 +6,7 @@
   domain_seed = '2560ad91705d2e5d259a7abc43a9f5f49631f06b75aae8e8c417c01bab229820',
 
   prefix4 = '10.80.176.0/21',
-  prefix6 = 'fc00:106::/64',
+  prefix6 = 'fd00:106::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:106::/64',
diff --git a/domains/ffmuc_uml_sued.conf b/domains/ffmuc_uml_sued.conf
index 87672897..e31e8860 100644
--- a/domains/ffmuc_uml_sued.conf
+++ b/domains/ffmuc_uml_sued.conf
@@ -6,7 +6,7 @@
   domain_seed = 'f14233863ee4ca3453914505c61f0e0417ed2da0b1695ba13a39bf67e6dabb04',
 
   prefix4 = '10.80.184.0/21',
-  prefix6 = 'fc00:107::/64',
+  prefix6 = 'fd00:107::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:107::/64',
diff --git a/domains/ffmuc_uml_west.conf b/domains/ffmuc_uml_west.conf
index 2595e230..32c97c1b 100644
--- a/domains/ffmuc_uml_west.conf
+++ b/domains/ffmuc_uml_west.conf
@@ -6,7 +6,7 @@
   domain_seed = '649b28f2a3c71293d62609e3673d95987d39f4fd19e52f8df4602c80127223b3',
 
   prefix4 = '10.80.192.0/21',
-  prefix6 = 'fc00:108::/64',
+  prefix6 = 'fd00:108::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:108::/64',
diff --git a/domains/ffmuc_welt.conf b/domains/ffmuc_welt.conf
index 2ecbaa52..3602b0f9 100644
--- a/domains/ffmuc_welt.conf
+++ b/domains/ffmuc_welt.conf
@@ -6,7 +6,7 @@
   domain_seed = '1f0b31cecdf980317f453b162ac476ee09cf9997b03e684d4f2f484e75d9cd26',
 
   prefix4 = '10.80.200.0/21',
-  prefix6 = 'fc00:109::/64',
+  prefix6 = 'fd00:109::/64',
 
   extra_prefixes6 = {
   '2001:678:e68:109::/64',