diff --git a/docker-compose/examples/grafana/docker-compose.yml b/docker-compose/examples/grafana/docker-compose.yml
index 21f7718..73bfe39 100644
--- a/docker-compose/examples/grafana/docker-compose.yml
+++ b/docker-compose/examples/grafana/docker-compose.yml
@@ -53,4 +53,4 @@ networks:
         ipam:
             driver: default
             config:
-                # - subnet: 172.21.184.0/24
+                - subnet: ${SUBNET}
diff --git a/docker-compose/examples/grafana/env/fqdn_context.env.example b/docker-compose/examples/grafana/env/fqdn_context.env.example
index e7d7042..cfec8dd 100644
--- a/docker-compose/examples/grafana/env/fqdn_context.env.example
+++ b/docker-compose/examples/grafana/env/fqdn_context.env.example
@@ -25,6 +25,16 @@ CONTEXT=cncf
 
 
 
+# Subnet to use for this Docker Compose project. Docker defaults to
+# container networks in prefix 172.16.0.0/12 which is 1 million addresses in
+# the range from 172.16.0.0 to 172.31.255.255. Docker uses 172.17.0.0/16 for
+# itself. Use any sensible prefix in 172.16.0.0/12 here except for Docker's
+# own 172.17.0.0/16.
+# ---
+SUBNET=172.30.95.0/24
+
+
+
 # See 'docker-compose.override.yml' for how to make a variable available in
 # a Dockerfile
 # ---
diff --git a/docker-compose/examples/hashicorpvault/docker-compose.yml b/docker-compose/examples/hashicorpvault/docker-compose.yml
index 6e0ecf9..0d917e1 100644
--- a/docker-compose/examples/hashicorpvault/docker-compose.yml
+++ b/docker-compose/examples/hashicorpvault/docker-compose.yml
@@ -25,4 +25,4 @@ networks:
         ipam:
             driver: default
             config:
-                # - subnet: 172.21.184.0/24
+                - subnet: ${SUBNET}
diff --git a/docker-compose/examples/hashicorpvault/env/fqdn_context.env.example b/docker-compose/examples/hashicorpvault/env/fqdn_context.env.example
index 7604081..b43af71 100644
--- a/docker-compose/examples/hashicorpvault/env/fqdn_context.env.example
+++ b/docker-compose/examples/hashicorpvault/env/fqdn_context.env.example
@@ -24,6 +24,16 @@ CONTEXT=fsf
 
 
 
+# Subnet to use for this Docker Compose project. Docker defaults to
+# container networks in prefix 172.16.0.0/12 which is 1 million addresses in
+# the range from 172.16.0.0 to 172.31.255.255. Docker uses 172.17.0.0/16 for
+# itself. Use any sensible prefix in 172.16.0.0/12 here except for Docker's
+# own 172.17.0.0/16.
+# ---
+SUBNET=172.30.95.0/24
+
+
+
 # See 'docker-compose.override.yml' for how to make a variable available in
 # a Dockerfile
 # ---
diff --git a/docker-compose/{{ cookiecutter.__project_slug }}/docker-compose.yml b/docker-compose/{{ cookiecutter.__project_slug }}/docker-compose.yml
index e4ce915..9f203e8 100644
--- a/docker-compose/{{ cookiecutter.__project_slug }}/docker-compose.yml	
+++ b/docker-compose/{{ cookiecutter.__project_slug }}/docker-compose.yml	
@@ -70,4 +70,4 @@ networks:
         ipam:
             driver: default
             config:
-                # - subnet: 172.21.184.0/24
+                - subnet: ${SUBNET}
diff --git a/docker-compose/{{ cookiecutter.__project_slug }}/env/fqdn_context.env.example b/docker-compose/{{ cookiecutter.__project_slug }}/env/fqdn_context.env.example
index 969b44a..78f62a3 100644
--- a/docker-compose/{{ cookiecutter.__project_slug }}/env/fqdn_context.env.example	
+++ b/docker-compose/{{ cookiecutter.__project_slug }}/env/fqdn_context.env.example	
@@ -31,6 +31,16 @@ CONTEXT={{ cookiecutter.__context_slug }}
 
 
 
+# Subnet to use for this Docker Compose project. Docker defaults to
+# container networks in prefix 172.16.0.0/12 which is 1 million addresses in
+# the range from 172.16.0.0 to 172.31.255.255. Docker uses 172.17.0.0/16 for
+# itself. Use any sensible prefix in 172.16.0.0/12 here except for Docker's
+# own 172.17.0.0/16.
+# ---
+SUBNET=172.30.95.0/24
+
+
+
 # See 'docker-compose.override.yml' for how to make a variable available in
 # a Dockerfile
 # ---