diff --git a/src/app.tsx b/src/app.tsx
index bb2e65b9..2d56f761 100644
--- a/src/app.tsx
+++ b/src/app.tsx
@@ -12,7 +12,18 @@ import useIsMobile from './hooks/use-is-mobile';
 import useTheme from './hooks/use-theme';
 import { useDirectories } from './hooks/use-directories';
 import { useResolvedSubplebbitAddress } from './hooks/use-resolved-subplebbit-address';
-import { getBoardPath, getSubplebbitAddress, isDirectoryBoard, isPostRoute, isPendingPostRoute, isModQueueRoute } from './lib/utils/route-utils';
+import {
+  getBoardPath,
+  getSubplebbitAddress,
+  isBoardModRoute,
+  isDirectoryBoard,
+  isLegacyBoardModQueueRoute,
+  isPostRoute,
+  isPendingPostRoute,
+  isModQueueRoute,
+  isValidBoardModRoute,
+  isValidModRoute,
+} from './lib/utils/route-utils';
 import styles from './app.module.css';
 import { DesktopBoardButtons, MobileBoardButtons } from './components/board-buttons';
 import Board from './views/board';
@@ -90,6 +101,20 @@ const BoardLayout = () => {
     return <Navigate to='/not-found' replace />;
   }
 
+  // Invalid /mod/ paths (e.g. /mod/modqueue, /mod/asdoijasd) -> not-found
+  if (location.pathname.startsWith('/mod/') && !isValidModRoute(location.pathname)) {
+    return <Navigate to='/not-found' replace />;
+  }
+
+  if (isLegacyBoardModQueueRoute(location.pathname)) {
+    return <Navigate to='/not-found' replace />;
+  }
+
+  // Invalid board-scoped mod paths (e.g. /biz/mod, /biz/mod/asdoijasd) -> not-found
+  if (isBoardModRoute(location.pathname) && !isValidBoardModRoute(location.pathname)) {
+    return <Navigate to='/not-found' replace />;
+  }
+
   // Normalize address URLs to directory codes: /anime-and-manga.eth/thread/xxx -> /a/thread/xxx
   if (boardIdentifier && !isDirectoryBoard(boardIdentifier, directories)) {
     const canonicalBoardIdentifier = getBoardPath(boardIdentifier, directories);
@@ -287,10 +312,12 @@ const App = () => {
             <Route path='/mod/catalog' element={catalogFeedElement} />
             <Route path='/mod/catalog/settings' element={catalogFeedElement} />
 
-            <Route path='/mod/modqueue' element={<ModQueueRoute />} />
-            <Route path='/mod/modqueue/settings' element={<ModQueueRoute />} />
+            <Route path='/mod/queue' element={<ModQueueRoute />} />
+            <Route path='/mod/queue/settings' element={<ModQueueRoute />} />
 
-            {/* Invalid subpaths: old time-filter URLs (e.g. /all/24h) -> not-found */}
+            {/* Invalid subpaths: old URLs and unknown paths -> not-found */}
+            <Route path='/mod/modqueue' element={<Navigate to='/not-found' replace />} />
+            <Route path='/mod/modqueue/settings' element={<Navigate to='/not-found' replace />} />
             <Route path='/all/*' element={<Navigate to='/not-found' replace />} />
             <Route path='/subs/*' element={<Navigate to='/not-found' replace />} />
             <Route path='/mod/*' element={<Navigate to='/not-found' replace />} />
@@ -302,8 +329,13 @@ const App = () => {
             <Route path='/:boardIdentifier/catalog' element={catalogFeedElement} />
             <Route path='/:boardIdentifier/catalog/settings' element={catalogFeedElement} />
 
-            <Route path='/:boardIdentifier/modqueue' element={<ModQueueRoute />} />
-            <Route path='/:boardIdentifier/modqueue/settings' element={<ModQueueRoute />} />
+            <Route path='/:boardIdentifier/mod/queue' element={<ModQueueRoute />} />
+            <Route path='/:boardIdentifier/mod/queue/settings' element={<ModQueueRoute />} />
+
+            <Route path='/:boardIdentifier/modqueue' element={<Navigate to='/not-found' replace />} />
+            <Route path='/:boardIdentifier/modqueue/settings' element={<Navigate to='/not-found' replace />} />
+            <Route path='/:boardIdentifier/mod' element={<Navigate to='/not-found' replace />} />
+            <Route path='/:boardIdentifier/mod/*' element={<Navigate to='/not-found' replace />} />
 
             <Route path='/:boardIdentifier/thread/:commentCid' element={<Post />} />
             <Route path='/:boardIdentifier/thread/:commentCid/settings' element={<Post />} />
diff --git a/src/lib/utils/__tests__/route-utils.test.ts b/src/lib/utils/__tests__/route-utils.test.ts
index a480aae8..815a623d 100644
--- a/src/lib/utils/__tests__/route-utils.test.ts
+++ b/src/lib/utils/__tests__/route-utils.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { isFeedRoute, normalizeMultiboardFeedPath } from '../route-utils';
+import { isBoardModRoute, isFeedRoute, isLegacyBoardModQueueRoute, isModQueueRoute, isValidBoardModRoute, normalizeMultiboardFeedPath } from '../route-utils';
 
 describe('normalizeMultiboardFeedPath', () => {
   it('normalizes /all/3 -> /all', () => {
@@ -41,4 +41,41 @@ describe('isFeedRoute', () => {
     expect(isFeedRoute('/subs/catalog/1w')).toBe(false);
     expect(isFeedRoute('/all/1w/3')).toBe(false);
   });
+
+  it('returns false for board-scoped mod namespace paths', () => {
+    expect(isFeedRoute('/biz/mod')).toBe(false);
+    expect(isFeedRoute('/biz/mod/queue')).toBe(false);
+  });
+});
+
+describe('board mod routes', () => {
+  it('recognizes canonical mod queue routes', () => {
+    expect(isModQueueRoute('/mod/queue')).toBe(true);
+    expect(isModQueueRoute('/biz/mod/queue')).toBe(true);
+    expect(isModQueueRoute('/biz/mod/queue/settings')).toBe(true);
+  });
+
+  it('does not recognize legacy board modqueue routes', () => {
+    expect(isModQueueRoute('/biz/modqueue')).toBe(false);
+  });
+
+  it('recognizes legacy board modqueue routes for rejection', () => {
+    expect(isLegacyBoardModQueueRoute('/biz/modqueue')).toBe(true);
+    expect(isLegacyBoardModQueueRoute('/biz/modqueue/settings')).toBe(true);
+    expect(isLegacyBoardModQueueRoute('/biz/mod/queue')).toBe(false);
+  });
+
+  it('recognizes board mod namespace paths', () => {
+    expect(isBoardModRoute('/biz/mod')).toBe(true);
+    expect(isBoardModRoute('/biz/mod/queue')).toBe(true);
+    expect(isBoardModRoute('/mod/queue')).toBe(false);
+  });
+
+  it('validates allowed board mod routes', () => {
+    expect(isValidBoardModRoute('/biz/mod/queue')).toBe(true);
+    expect(isValidBoardModRoute('/biz/mod/queue/settings')).toBe(true);
+    expect(isValidBoardModRoute('/biz/mod')).toBe(false);
+    expect(isValidBoardModRoute('/biz/mod/log')).toBe(false);
+    expect(isValidBoardModRoute('/biz/modqueue')).toBe(false);
+  });
 });
diff --git a/src/lib/utils/route-utils.ts b/src/lib/utils/route-utils.ts
index 2683c24a..5ae7ca12 100644
--- a/src/lib/utils/route-utils.ts
+++ b/src/lib/utils/route-utils.ts
@@ -120,7 +120,7 @@ export const isFeedRoute = (pathname: string): boolean => {
 
   if (normalizedPath.includes('/thread/')) return false;
   if (normalizedPath.startsWith('/pending/')) return false;
-  if (normalizedPath.includes('/modqueue')) return false;
+  if (isBoardModRoute(normalizedPath) || isModQueueRoute(normalizedPath)) return false;
 
   const pathWithoutSettings = normalizedPath.replace(/\/settings$/, '');
   const segments = pathWithoutSettings.split('/').filter(Boolean);
@@ -147,9 +147,38 @@ export const isPendingPostRoute = (pathname: string): boolean => {
   return normalizedPath.startsWith('/pending/');
 };
 
+export const isBoardModRoute = (pathname: string): boolean => {
+  const normalizedPath = pathname.replace(/\/$/, '');
+  return /^\/[^/]+\/mod(?:\/.*)?$/.test(normalizedPath);
+};
+
+export const isLegacyBoardModQueueRoute = (pathname: string): boolean => {
+  const normalizedPath = pathname.replace(/\/$/, '');
+  return /^\/[^/]+\/modqueue(?:\/settings)?$/.test(normalizedPath);
+};
+
 export const isModQueueRoute = (pathname: string): boolean => {
-  const normalizedPath = pathname.replace(/\/settings$/, '');
-  return normalizedPath.includes('/modqueue');
+  const normalizedPath = pathname.replace(/\/settings$/, '').replace(/\/$/, '');
+  return normalizedPath === '/mod/queue' || /^\/[^/]+\/mod\/queue$/.test(normalizedPath);
+};
+
+const VALID_MOD_PATHS = ['/mod', '/mod/settings', '/mod/catalog', '/mod/catalog/settings', '/mod/queue', '/mod/queue/settings'];
+const VALID_BOARD_MOD_SUBPATHS = ['queue', 'queue/settings'];
+
+export const isValidModRoute = (pathname: string): boolean => {
+  const normalized = pathname.replace(/\/$/, '');
+  return VALID_MOD_PATHS.includes(normalized);
+};
+
+export const isValidBoardModRoute = (pathname: string): boolean => {
+  const normalizedPath = pathname.replace(/\/$/, '');
+  const match = normalizedPath.match(/^\/[^/]+\/mod(?:\/(.*))?$/);
+  if (!match) {
+    return false;
+  }
+
+  const subpath = match[1] ?? '';
+  return VALID_BOARD_MOD_SUBPATHS.includes(subpath);
 };
 
 /** Page numbers 1–10 for board feed pagination */
@@ -228,7 +257,7 @@ export const getFeedCacheKey = (pathname: string): string | null => {
     return null;
   }
 
-  if (normalizedPath.includes('/modqueue')) {
+  if (isBoardModRoute(normalizedPath) || isModQueueRoute(normalizedPath)) {
     return null;
   }
 
diff --git a/src/lib/utils/url-utils.ts b/src/lib/utils/url-utils.ts
index c817e166..f5323ce2 100644
--- a/src/lib/utils/url-utils.ts
+++ b/src/lib/utils/url-utils.ts
@@ -82,10 +82,11 @@ export const is5chanLink = (url: string): boolean => {
     // - /{boardIdentifier} (directory code or address)
     // - /{boardIdentifier}/thread/{commentCid}
     // - /{boardIdentifier}/catalog
+    // - /{boardIdentifier}/mod/queue
     // - /all, /subs, /mod, /pending/{index}
     return (
       /^\/p\/[^/]+(\/c\/[^/]+)?$/.test(routePath) ||
-      /^\/[^/]+(\/thread\/[^/]+|\/catalog)?$/.test(routePath) ||
+      /^\/[^/]+(\/thread\/[^/]+|\/catalog|\/mod\/queue)?$/.test(routePath) ||
       /^\/(all|subscriptions|mod)(\/catalog|\/thread\/[^/]+)?(\/[^/]+)?$/.test(routePath) ||
       /^\/pending\/[^/]+$/.test(routePath)
     );
diff --git a/src/lib/utils/view-utils.ts b/src/lib/utils/view-utils.ts
index dae8f71b..ef29a79f 100644
--- a/src/lib/utils/view-utils.ts
+++ b/src/lib/utils/view-utils.ts
@@ -1,3 +1,5 @@
+import { isBoardModRoute, isModQueueRoute } from './route-utils';
+
 export type ParamsType = {
   accountCommentIndex?: string;
   boardIdentifier?: string;
@@ -17,6 +19,7 @@ export const isBoardView = (pathname: string, params: ParamsType): boolean => {
     pathname.startsWith('/all') ||
     pathname.startsWith('/subs') ||
     pathname.startsWith('/mod') ||
+    isBoardModRoute(pathname) ||
     pathname.startsWith('/pending') ||
     pathname === '/' ||
     pathname.startsWith('/faq') ||
@@ -53,7 +56,7 @@ export const isModView = (pathname: string): boolean => {
 };
 
 export const isModQueueView = (pathname: string): boolean => {
-  return pathname.includes('/modqueue');
+  return isModQueueRoute(pathname);
 };
 
 export const isPendingPostView = (pathname: string, params: ParamsType): boolean => {
diff --git a/src/views/mod-queue/mod-queue.tsx b/src/views/mod-queue/mod-queue.tsx
index 61858607..6a6aa50d 100644
--- a/src/views/mod-queue/mod-queue.tsx
+++ b/src/views/mod-queue/mod-queue.tsx
@@ -269,7 +269,7 @@ const ModQueueRow = memo(({ comment, isOdd = false, showBoard = false, boardPath
   const threadTargetCid = threadCid || cid;
   const postUrl = boardPath && threadTargetCid ? `/${boardPath}/thread/${threadTargetCid}` : undefined;
 
-  const modQueueUrl = boardPath ? `/${boardPath}/modqueue` : undefined;
+  const modQueueUrl = boardPath ? `/${boardPath}/mod/queue` : undefined;
 
   return (
     <div className={`${styles.row} ${isOdd ? styles.rowOdd : ''}`}>
@@ -370,7 +370,7 @@ const ModQueueCard = memo(({ comment, showBoard = false, boardPath }: ModQueueCa
   const threadTargetCid = threadCid || cid;
   const postUrl = boardPath && threadTargetCid ? `/${boardPath}/thread/${threadTargetCid}` : undefined;
 
-  const modQueueUrl = boardPath ? `/${boardPath}/modqueue` : undefined;
+  const modQueueUrl = boardPath ? `/${boardPath}/mod/queue` : undefined;
 
   return (
     <div className={styles.mobileCard}>
@@ -651,7 +651,7 @@ const ModQueueButtonContent = ({ feed, alertThresholdSeconds, boardIdentifier, i
   }, [statusMap]);
 
   const totalCount = normalCount + urgentCount;
-  const to = boardIdentifier ? `/${boardIdentifier}/modqueue` : '/mod/modqueue';
+  const to = boardIdentifier ? `/${boardIdentifier}/mod/queue` : '/mod/queue';
 
   const buttonContent = (
     <button className='button'>