diff --git a/keyserver/src/responders/website-responders.js b/keyserver/src/responders/website-responders.js
--- a/keyserver/src/responders/website-responders.js
+++ b/keyserver/src/responders/website-responders.js
@@ -299,6 +299,7 @@
 
   const statePromises = {
     navInfo: navInfoPromise,
+    deviceID: null,
     currentUserInfo: ((currentUserInfoPromise: any): Promise<CurrentUserInfo>),
     sessionID: sessionIDPromise,
     entryStore: entryStorePromise,
diff --git a/web/redux/action-types.js b/web/redux/action-types.js
--- a/web/redux/action-types.js
+++ b/web/redux/action-types.js
@@ -1,3 +1,4 @@
 // @flow
 
 export const updateWindowActiveActionType = 'UPDATE_WINDOW_ACTIVE';
+export const setDeviceIDActionType = 'SET_DEVICE_ID';
diff --git a/web/redux/device-id-reducer.js b/web/redux/device-id-reducer.js
new file mode 100644
--- /dev/null
+++ b/web/redux/device-id-reducer.js
@@ -0,0 +1,19 @@
+// @flow
+
+import type { Action } from '../redux/redux-setup';
+import { deviceIDCharLength } from '../utils//device-id';
+import { setDeviceIDActionType } from './action-types';
+
+const deviceIDRegex = new RegExp(
+  `^(ks|mobile|web):[a-zA-Z0-9]{${deviceIDCharLength.toString()}}$`,
+);
+
+export function reduceDeviceID(state: ?string, action: Action): ?string {
+  if (action.type === setDeviceIDActionType) {
+    if (action.payload?.match(deviceIDRegex)) {
+      return action.payload;
+    }
+    return null;
+  }
+  return state;
+}
diff --git a/web/redux/redux-setup.js b/web/redux/redux-setup.js
--- a/web/redux/redux-setup.js
+++ b/web/redux/redux-setup.js
@@ -27,13 +27,18 @@
 
 import { activeThreadSelector } from '../selectors/nav-selectors';
 import { type NavInfo, updateNavInfoActionType } from '../types/nav-types';
-import { updateWindowActiveActionType } from './action-types';
+import {
+  updateWindowActiveActionType,
+  setDeviceIDActionType,
+} from './action-types';
+import { reduceDeviceID } from './device-id-reducer';
 import reduceNavInfo from './nav-reducer';
 import { getVisibility } from './visibility';
 
 export type WindowDimensions = { width: number, height: number };
 export type AppState = {
   navInfo: NavInfo,
+  deviceID: ?string,
   currentUserInfo: ?CurrentUserInfo,
   sessionID: ?string,
   entryStore: EntryStore,
@@ -73,6 +78,10 @@
   | {
       type: 'UPDATE_WINDOW_ACTIVE',
       payload: boolean,
+    }
+  | {
+      type: 'SET_DEVICE_ID',
+      payload: string,
     };
 
 export function reducer(oldState: AppState | void, action: Action): AppState {
@@ -120,7 +129,10 @@
     return oldState;
   }
 
-  if (action.type !== updateNavInfoActionType) {
+  if (
+    action.type !== updateNavInfoActionType &&
+    action.type !== setDeviceIDActionType
+  ) {
     state = baseReducer(state, action).state;
   }
 
@@ -131,6 +143,7 @@
       action,
       state.threadStore.threadInfos,
     ),
+    deviceID: reduceDeviceID(state.deviceID, action),
   };
 
   return validateState(oldState, state);