diff --git a/README.md b/README.md
index 47ed673..25e27c1 100644
--- a/README.md
+++ b/README.md
@@ -396,7 +396,7 @@ IPv6 address from an IPv4 address:
 ```yaml
 addresses:
   loopback:
-    - 103.153.6.2/24
+    - 198.51.100.2/24
     - ~^ip6
 ```
 
@@ -405,8 +405,8 @@ This will be translated to:
 ```yaml
 addresses:
   loopback:
-    - 103.153.6.2/24
-    - 2406:3bc0:100:b1:a:de:103.153.6.2/120
+    - 198.51.100.2/24
+    - 2406:3bc0:100:b1:a:de:198.51.100.2/120
 ```
 
 This requires `base-public-6` to be defined in `topology.yaml`.
diff --git a/data/groups/edge-sk1/bgp.yaml b/data/groups/edge-sk1/bgp.yaml
index 9198454..98a45ba 100644
--- a/data/groups/edge-sk1/bgp.yaml
+++ b/data/groups/edge-sk1/bgp.yaml
@@ -1,5 +1,5 @@
 supernets:
-  103.153.6.0/24:
+  198.51.100.0/24:
     country: KR
   2406:3bc0::/40:
   2406:3bc0:100::/40:
diff --git a/data/groups/edge-sk1/topology.yaml b/data/groups/edge-sk1/topology.yaml
index 304aa5b..99ac574 100644
--- a/data/groups/edge-sk1/topology.yaml
+++ b/data/groups/edge-sk1/topology.yaml
@@ -1,2 +1,2 @@
 subnets:
-  interco: 103.153.6.8/31
+  interco: 198.51.100.8/31
diff --git a/data/groups/sk1/topology.yaml b/data/groups/sk1/topology.yaml
index 7d58bf4..5edd1fd 100644
--- a/data/groups/sk1/topology.yaml
+++ b/data/groups/sk1/topology.yaml
@@ -27,7 +27,7 @@ patchpanels:
         port: GigabitEthernet0/0/0/0
 
 base: 172.29.0.0/16
-base-public: 103.153.6.0/24
+base-public: 198.51.100.0/24
 base-provisioning: 10.142.0.0/15
 vlans:
   public: 100
diff --git a/data/host/none/bgp.yaml b/data/host/none/bgp.yaml
index 3308602..7d4d742 100644
--- a/data/host/none/bgp.yaml
+++ b/data/host/none/bgp.yaml
@@ -16,7 +16,7 @@ irr:
     2a0a:e800::/29:
       netname: FR-BLADE-20160812
   apnic:
-    - 103.153.6.0/23
+    - 198.51.100.0/23
     - 2406:3bc0::/32
   arin:
     - 162.213.48.0/21
diff --git a/data/host/sk1/edge1/topology.yaml b/data/host/sk1/edge1/topology.yaml
index 3b8d614..e46b94e 100644
--- a/data/host/sk1/edge1/topology.yaml
+++ b/data/host/sk1/edge1/topology.yaml
@@ -85,6 +85,6 @@ interfaces:
     connectivity: 10G
 addresses:
   loopback:
-    - 103.153.6.1
+    - 198.51.100.1
     - ~^ip6
   main: 172.29.15.28/21
diff --git a/data/host/sk1/edge2/topology.yaml b/data/host/sk1/edge2/topology.yaml
index 89be3f8..a335f22 100644
--- a/data/host/sk1/edge2/topology.yaml
+++ b/data/host/sk1/edge2/topology.yaml
@@ -39,6 +39,6 @@ interfaces:
     connectivity: 10G
 addresses:
   loopback:
-    - 103.153.6.2
+    - 198.51.100.2
     - ~^ip6
   main: 172.29.15.29/21
diff --git a/data/host/sk1/gateway1/topology.yaml b/data/host/sk1/gateway1/topology.yaml
index c3609c6..af9fe85 100644
--- a/data/host/sk1/gateway1/topology.yaml
+++ b/data/host/sk1/gateway1/topology.yaml
@@ -1,4 +1,4 @@
 addresses:
   oob: 172.29.15.253/21
-  public: 103.153.6.4
+  public: 198.51.100.4
   rescue: 121.78.242.10/29
diff --git a/data/host/sk1/gateway2/topology.yaml b/data/host/sk1/gateway2/topology.yaml
index 5abdde0..53e253b 100644
--- a/data/host/sk1/gateway2/topology.yaml
+++ b/data/host/sk1/gateway2/topology.yaml
@@ -1,4 +1,4 @@
 addresses:
   oob: 172.29.15.252/21
-  public: 103.153.6.5
+  public: 198.51.100.5
   rescue: 121.78.242.11/29