diff --git a/lib/selectors/keyserver-selectors.js b/lib/selectors/keyserver-selectors.js
--- a/lib/selectors/keyserver-selectors.js
+++ b/lib/selectors/keyserver-selectors.js
@@ -42,8 +42,13 @@
 const currentAsOfSelector: (state: AppState) => number = (state: AppState) =>
   state.messageStore.currentAsOf[ashoatKeyserverID] ?? 0;
 
-const urlPrefixSelector: (state: AppState) => ?string = (state: AppState) =>
-  state.keyserverStore.keyserverInfos[ashoatKeyserverID]?.urlPrefix;
+const baseUrlPrefixSelector: (
+  keyserverID: string,
+) => (state: AppState) => ?string = keyserverID => (state: AppState) =>
+  state.keyserverStore.keyserverInfos[keyserverID]?.urlPrefix;
+
+const urlPrefixSelector: (keyserverID: string) => (state: AppState) => ?string =
+  _memoize(baseUrlPrefixSelector);
 
 const baseConnectionSelector: (
   keyserverID: string,
diff --git a/lib/selectors/server-calls.js b/lib/selectors/server-calls.js
--- a/lib/selectors/server-calls.js
+++ b/lib/selectors/server-calls.js
@@ -32,7 +32,7 @@
 ) => (state: AppState) => ServerCallState = keyserverID =>
   createSelector(
     cookieSelector,
-    urlPrefixSelector,
+    urlPrefixSelector(keyserverID),
     sessionIDSelector,
     (state: AppState) => state.currentUserInfo,
     connectionSelector(keyserverID),
diff --git a/native/account/logged-out-modal.react.js b/native/account/logged-out-modal.react.js
--- a/native/account/logged-out-modal.react.js
+++ b/native/account/logged-out-modal.react.js
@@ -810,7 +810,7 @@
     );
     const persistedStateLoaded = usePersistedStateLoaded();
     const cookie = useSelector(cookieSelector);
-    const urlPrefix = useSelector(urlPrefixSelector);
+    const urlPrefix = useSelector(urlPrefixSelector(ashoatKeyserverID));
     invariant(urlPrefix, "missing urlPrefix for ashoat's keyserver");
     const loggedIn = useSelector(isLoggedIn);
     const dimensions = useSelector(derivedDimensionsInfoSelector);
diff --git a/native/data/sqlite-data-handler.js b/native/data/sqlite-data-handler.js
--- a/native/data/sqlite-data-handler.js
+++ b/native/data/sqlite-data-handler.js
@@ -48,7 +48,7 @@
     state => !!(state._persist && state._persist.rehydrated),
   );
   const cookie = useSelector(cookieSelector);
-  const urlPrefix = useSelector(urlPrefixSelector);
+  const urlPrefix = useSelector(urlPrefixSelector(ashoatKeyserverID));
   invariant(urlPrefix, "missing urlPrefix for ashoat's keyserver");
   const staffCanSee = useStaffCanSee();
   const { staffUserHasBeenLoggedIn } = React.useContext(StaffContext);
diff --git a/native/profile/custom-server-modal.react.js b/native/profile/custom-server-modal.react.js
--- a/native/profile/custom-server-modal.react.js
+++ b/native/profile/custom-server-modal.react.js
@@ -8,6 +8,7 @@
 import { urlPrefixSelector } from 'lib/selectors/keyserver-selectors.js';
 import type { Dispatch } from 'lib/types/redux-types.js';
 import { setURLPrefix } from 'lib/utils/url-utils.js';
+import { ashoatKeyserverID } from 'lib/utils/validation-utils.js';
 
 import Button from '../components/button.react.js';
 import Modal from '../components/modal.react.js';
@@ -119,7 +120,7 @@
 
 const ConnectedCustomServerModal: React.ComponentType<BaseProps> =
   React.memo<BaseProps>(function ConnectedCustomServerModal(props: BaseProps) {
-    const urlPrefix = useSelector(urlPrefixSelector);
+    const urlPrefix = useSelector(urlPrefixSelector(ashoatKeyserverID));
     invariant(urlPrefix, "missing urlPrefix for ashoat's keyserver");
     const customServer = useSelector(state => state.customServer);
     const styles = useStyles(unboundStyles);
diff --git a/native/profile/dev-tools.react.js b/native/profile/dev-tools.react.js
--- a/native/profile/dev-tools.react.js
+++ b/native/profile/dev-tools.react.js
@@ -9,6 +9,7 @@
 import { urlPrefixSelector } from 'lib/selectors/keyserver-selectors.js';
 import type { Dispatch } from 'lib/types/redux-types.js';
 import { setURLPrefix } from 'lib/utils/url-utils.js';
+import { ashoatKeyserverID } from 'lib/utils/validation-utils.js';
 
 import type { ProfileNavigationProp } from './profile.react.js';
 import Button from '../components/button.react.js';
@@ -236,7 +237,7 @@
 
 const ConnectedDevTools: React.ComponentType<BaseProps> = React.memo<BaseProps>(
   function ConnectedDevTools(props: BaseProps) {
-    const urlPrefix = useSelector(urlPrefixSelector);
+    const urlPrefix = useSelector(urlPrefixSelector(ashoatKeyserverID));
     invariant(urlPrefix, "missing urlPrefix for ashoat's keyserver");
     const customServer = useSelector(state => state.customServer);
     const colors = useColors();
diff --git a/native/selectors/socket-selectors.js b/native/selectors/socket-selectors.js
--- a/native/selectors/socket-selectors.js
+++ b/native/selectors/socket-selectors.js
@@ -1,5 +1,6 @@
 // @flow
 
+import _memoize from 'lodash/memoize.js';
 import { createSelector } from 'reselect';
 
 import {
@@ -27,9 +28,11 @@
 import type { AppState } from '../redux/state-types.js';
 import type { NavPlusRedux } from '../types/selector-types.js';
 
-const openSocketSelector: (state: AppState) => ?() => WebSocket =
+const baseOpenSocketSelector: (
+  keyserverID: string,
+) => (state: AppState) => ?() => WebSocket = keyserverID =>
   createSelector(
-    urlPrefixSelector,
+    urlPrefixSelector(keyserverID),
     // We don't actually use the cookie in the socket open function,
     // but we do use it in the initial message, and when the cookie changes
     // the socket needs to be reopened. By including the cookie here,
@@ -44,6 +47,10 @@
     },
   );
 
+const openSocketSelector: (
+  keyserverID: string,
+) => (state: AppState) => ?() => WebSocket = _memoize(baseOpenSocketSelector);
+
 const sessionIdentificationSelector: (
   state: AppState,
 ) => SessionIdentification = createSelector(
diff --git a/native/socket.react.js b/native/socket.react.js
--- a/native/socket.react.js
+++ b/native/socket.react.js
@@ -46,7 +46,7 @@
     const navContext = React.useContext(NavContext);
 
     const cookie = useSelector(cookieSelector);
-    const urlPrefix = useSelector(urlPrefixSelector);
+    const urlPrefix = useSelector(urlPrefixSelector(ashoatKeyserverID));
     invariant(urlPrefix, 'missing urlPrefix for given keyserver id');
     const connection = useSelector(connectionSelector(ashoatKeyserverID));
     invariant(connection, 'keyserver missing from keyserverStore');
@@ -59,7 +59,7 @@
     );
     const currentUserInfo = useSelector(state => state.currentUserInfo);
 
-    const openSocket = useSelector(openSocketSelector);
+    const openSocket = useSelector(openSocketSelector(ashoatKeyserverID));
     invariant(openSocket, 'openSocket failed to be created');
     const sessionIdentification = useSelector(sessionIdentificationSelector);
     const preRequestUserState = useSelector(preRequestUserStateSelector);
diff --git a/web/selectors/socket-selectors.js b/web/selectors/socket-selectors.js
--- a/web/selectors/socket-selectors.js
+++ b/web/selectors/socket-selectors.js
@@ -1,6 +1,7 @@
 // @flow
 
 import olm from '@commapp/olm';
+import _memoize from 'lodash/memoize.js';
 import { createSelector } from 'reselect';
 
 import {
@@ -32,14 +33,20 @@
 import { initOlm } from '../olm/olm-utils.js';
 import type { AppState } from '../redux/redux-setup.js';
 
-const openSocketSelector: (state: AppState) => ?() => WebSocket =
-  createSelector(urlPrefixSelector, (urlPrefix: ?string) => {
+const baseOpenSocketSelector: (
+  keyserverID: string,
+) => (state: AppState) => ?() => WebSocket = keyserverID =>
+  createSelector(urlPrefixSelector(keyserverID), (urlPrefix: ?string) => {
     if (!urlPrefix) {
       return null;
     }
     return createOpenSocketFunction(urlPrefix);
   });
 
+const openSocketSelector: (
+  keyserverID: string,
+) => (state: AppState) => ?() => WebSocket = _memoize(baseOpenSocketSelector);
+
 const sessionIdentificationSelector: (
   state: AppState,
 ) => SessionIdentification = createSelector(
diff --git a/web/socket.react.js b/web/socket.react.js
--- a/web/socket.react.js
+++ b/web/socket.react.js
@@ -32,7 +32,7 @@
 const WebSocket: React.ComponentType<BaseSocketProps> =
   React.memo<BaseSocketProps>(function WebSocket(props) {
     const cookie = useSelector(cookieSelector);
-    const urlPrefix = useSelector(urlPrefixSelector);
+    const urlPrefix = useSelector(urlPrefixSelector(ashoatKeyserverID));
     invariant(urlPrefix, 'missing urlPrefix for given keyserver id');
     const connection = useSelector(connectionSelector(ashoatKeyserverID));
     invariant(connection, 'keyserver missing from keyserverStore');
@@ -43,7 +43,7 @@
         state.lifecycleState !== 'background',
     );
 
-    const openSocket = useSelector(openSocketSelector);
+    const openSocket = useSelector(openSocketSelector(ashoatKeyserverID));
     invariant(openSocket, 'openSocket failed to be created');
     const sessionIdentification = useSelector(sessionIdentificationSelector);
     const preRequestUserState = useSelector(preRequestUserStateSelector);