diff --git a/1systems/gum.nix b/1systems/gum.nix
index 7104216..7bac439 100644
--- a/1systems/gum.nix
+++ b/1systems/gum.nix
@@ -2,8 +2,8 @@
 
 with config.krebs.lib;
 let
-  external-ip = head config.krebs.build.host.nets.internet.addrs4;
-  internal-ip = head config.krebs.build.host.nets.retiolum.addrs4;
+  external-ip = config.krebs.build.host.nets.internet.ip4.addr;
+  internal-ip = config.krebs.build.host.nets.retiolum.ip4.addr;
 in {
   imports = [
       ../.
diff --git a/1systems/wry.nix b/1systems/wry.nix
index edaf1b8..d9f8ded 100644
--- a/1systems/wry.nix
+++ b/1systems/wry.nix
@@ -3,8 +3,8 @@
 with config.krebs.lib;
 let
 
-  external-ip = head config.krebs.build.host.nets.internet.addrs4;
-  internal-ip = head config.krebs.build.host.nets.retiolum.addrs4;
+  external-ip = config.krebs.build.host.nets.internet.ip4.addr;
+  internal-ip = config.krebs.build.host.nets.retiolum.ip4.addr;
 in {
   imports = [
       ../.
diff --git a/2configs/deployment/mycube.connector.one.nix b/2configs/deployment/mycube.connector.one.nix
index 125b3df..8f51c91 100644
--- a/2configs/deployment/mycube.connector.one.nix
+++ b/2configs/deployment/mycube.connector.one.nix
@@ -3,7 +3,7 @@
 with config.krebs.lib;
 let
   hostname = config.krebs.build.host.name;
-  external-ip = head config.krebs.build.host.nets.internet.addrs4;
+  external-ip = config.krebs.build.host.nets.internet.ip4.addr;
   wsgi-sock = "${config.services.uwsgi.runDir}/uwsgi.sock";
 in {
   services.redis.enable = true;
diff --git a/2configs/iodined.nix b/2configs/iodined.nix
index 2e69d16..d57c91c 100644
--- a/2configs/iodined.nix
+++ b/2configs/iodined.nix
@@ -10,7 +10,7 @@ in {
     enable = true;
     domain = domain;
     ip = "172.16.10.1/24";
-    extraConfig = "-P ${pw} -l ${pkgs.lib.head config.krebs.build.host.nets.internet.addrs4}";
+    extraConfig = "-P ${pw} -l ${config.krebs.build.host.nets.internet.ip4.addr}";
   };
 
 }
diff --git a/2configs/nginx/euer.blog.nix b/2configs/nginx/euer.blog.nix
index 9d08f4b..137c0b0 100644
--- a/2configs/nginx/euer.blog.nix
+++ b/2configs/nginx/euer.blog.nix
@@ -8,8 +8,8 @@ let
   hostname = config.krebs.build.host.name;
   user = config.services.nginx.user;
   group = config.services.nginx.group;
-  external-ip = head config.krebs.build.host.nets.internet.addrs4;
-  internal-ip = head config.krebs.build.host.nets.retiolum.addrs4;
+  external-ip = config.krebs.build.host.nets.internet.ip4.addr;
+  internal-ip = config.krebs.build.host.nets.retiolum.ip4.addr;
   base-dir = "/var/www/blog.euer";
 in {
   # Prepare Blog directory
diff --git a/2configs/nginx/euer.test.nix b/2configs/nginx/euer.test.nix
index f7214e6..84b9bac 100644
--- a/2configs/nginx/euer.test.nix
+++ b/2configs/nginx/euer.test.nix
@@ -5,8 +5,8 @@ let
   hostname = config.krebs.build.host.name;
   user = config.services.nginx.user;
   group = config.services.nginx.group;
-  external-ip = head config.krebs.build.host.nets.internet.addrs4;
-  internal-ip = head config.krebs.build.host.nets.retiolum.addrs4;
+  external-ip = config.krebs.build.host.nets.internet.ip4.addr;
+  internal-ip = config.krebs.build.host.nets.retiolum.ip4.addr;
 in {
   krebs.nginx = {
     enable = mkDefault true;
diff --git a/2configs/nginx/euer.wiki.nix b/2configs/nginx/euer.wiki.nix
index a5572a5..10985c8 100644
--- a/2configs/nginx/euer.wiki.nix
+++ b/2configs/nginx/euer.wiki.nix
@@ -18,8 +18,8 @@ let
   #  user1 = pass1
   #  userN = passN
   tw-pass-file = "${sec}/tw-pass.ini";
-  external-ip = head config.krebs.build.host.nets.internet.addrs4;
-  internal-ip = head config.krebs.build.host.nets.retiolum.addrs4;
+  external-ip = config.krebs.build.host.nets.internet.ip4.addr;
+  internal-ip = config.krebs.build.host.nets.retiolum.ip4.addr;
 in {
   services.phpfpm = {
     # phpfpm does not have an enable option
diff --git a/2configs/nginx/update.connector.one.nix b/2configs/nginx/update.connector.one.nix
index ac5e6b1..dde3e3a 100644
--- a/2configs/nginx/update.connector.one.nix
+++ b/2configs/nginx/update.connector.one.nix
@@ -3,7 +3,7 @@
 with config.krebs.lib;
 let
   hostname = config.krebs.build.host.name;
-  external-ip = head config.krebs.build.host.nets.internet.addrs4;
+  external-ip = config.krebs.build.host.nets.internet.ip4.addr;
 in {
   krebs.nginx = {
     enable = mkDefault true;
diff --git a/2configs/omo-share.nix b/2configs/omo-share.nix
index 3a4dd45..c943e3d 100644
--- a/2configs/omo-share.nix
+++ b/2configs/omo-share.nix
@@ -5,7 +5,7 @@ let
   hostname = config.krebs.build.host.name;
   # TODO local-ip from the nets config
   local-ip = "192.168.1.11";
-  # local-ip = head config.krebs.build.host.nets.retiolum.addrs4;
+  # local-ip = config.krebs.build.host.nets.retiolum.ip4.addr;
 in {
   krebs.nginx = {
     enable = mkDefault true;