diff --git a/apps/fz_http/lib/fz_http/devices/device.ex b/apps/fz_http/lib/fz_http/devices/device.ex
index 1ffa12766..1752165c3 100644
--- a/apps/fz_http/lib/fz_http/devices/device.ex
+++ b/apps/fz_http/lib/fz_http/devices/device.ex
@@ -16,6 +16,7 @@ defmodule FzHttp.Devices.Device do
     field :private_key, FzHttp.Encrypted.Binary
     field :server_public_key, :string
     field :remote_ip, EctoNetwork.INET
+    field :octet_sequence, :integer, read_after_writes: true
     field :interface_address4, EctoNetwork.INET
     field :interface_address6, EctoNetwork.INET
     field :last_seen_at, :utc_datetime_usec
@@ -30,6 +31,7 @@ defmodule FzHttp.Devices.Device do
     |> cast(attrs, [
       :allowed_ips,
       :remote_ip,
+      :octet_sequence,
       :interface_address4,
       :interface_address6,
       :server_public_key,
diff --git a/apps/fz_http/lib/fz_http_web/live/device_live/show.html.leex b/apps/fz_http/lib/fz_http_web/live/device_live/show.html.leex
index 5b59a507c..2a2f83ddf 100644
--- a/apps/fz_http/lib/fz_http_web/live/device_live/show.html.leex
+++ b/apps/fz_http/lib/fz_http_web/live/device_live/show.html.leex
@@ -26,6 +26,11 @@
         </dt>
         <dd><%= @device.name %></dd>
 
+        <dt>
+          <strong>Interface IP:</strong>
+        </dt>
+        <dd>10.3.2.<%= @device.octet_sequence %></dd>
+
         <dt>
           <strong>Public key:</strong>
         </dt>
@@ -77,7 +82,7 @@
       <pre><code id="wg-conf">
 [Interface]
 PrivateKey = <%= @device.private_key %>
-Address = 172.16.99.1/24
+Address = 10.3.2.<%= @device.octet_sequence %>
 DNS = 1.1.1.1, 1.0.0.1
 
 [Peer]
diff --git a/apps/fz_http/priv/repo/migrations/20200228145810_create_devices.exs b/apps/fz_http/priv/repo/migrations/20200228145810_create_devices.exs
index 64e2fa985..b4b6c68a1 100644
--- a/apps/fz_http/priv/repo/migrations/20200228145810_create_devices.exs
+++ b/apps/fz_http/priv/repo/migrations/20200228145810_create_devices.exs
@@ -10,6 +10,8 @@ defmodule FzHttp.Repo.Migrations.CreateDevices do
       add :private_key, :bytea, null: false
       add :server_public_key, :string, null: false
       add :remote_ip, :inet
+      # XXX: Rework this in app code
+      add :octet_sequence, :serial
       add :interface_address4, :inet
       add :interface_address6, :inet
       add :last_seen_at, :utc_datetime_usec
@@ -23,5 +25,6 @@ defmodule FzHttp.Repo.Migrations.CreateDevices do
     create unique_index(:devices, [:private_key])
     create unique_index(:devices, [:preshared_key])
     create unique_index(:devices, [:user_id, :name])
+    create unique_index(:devices, [:octet_sequence])
   end
 end