diff --git a/web/src/components/DiffView.tsx b/web/src/components/DiffView.tsx
index 463fa51..7671b8e 100644
--- a/web/src/components/DiffView.tsx
+++ b/web/src/components/DiffView.tsx
@@ -1,11 +1,12 @@
 import type { ReactNode } from "react"
-import { ArrowRight, CircleCheck, Lock, Pencil, Trash2 } from "lucide-react"
+import { ArrowRight, BookmarkCheck, CircleCheck, Lock, Pencil, Trash2, Undo2 } from "lucide-react"
 import { Badge } from "@/components/ui/badge"
+import { Button } from "@/components/ui/button"
 import { Checkbox } from "@/components/ui/checkbox"
 import { cn } from "@/lib/utils"
 import type { ChangesetResponse, RecordView } from "@/api/types"
 
-type Tone = "update" | "delete" | "readonly"
+type Tone = "update" | "delete" | "custom" | "readonly"
 
 const TONE_META: Record<
   Tone,
@@ -25,6 +26,13 @@ const TONE_META: Record<
     dot: "var(--diff-delete)",
     ring: "ring-[color-mix(in_oklch,var(--diff-delete),transparent_78%)]",
   },
+  custom: {
+    label: "Customs",
+    empty: "Нет записей, помеченных как осознанные.",
+    icon: BookmarkCheck,
+    dot: "var(--diff-custom)",
+    ring: "ring-[color-mix(in_oklch,var(--diff-custom),transparent_80%)]",
+  },
   readonly: {
     label: "Read-only",
     empty: "Нет read-only записей.",
@@ -46,11 +54,13 @@ function RecordRow({
   tone,
   checked,
   onToggle,
+  action,
 }: {
   record: RecordView
   tone: Tone
   checked?: boolean
   onToggle?: (key: string) => void
+  action?: ReactNode
 }) {
   const meta = TONE_META[tone]
   const showArrow = tone !== "delete"
@@ -99,6 +109,8 @@ function RecordRow({
             read-only
           </Badge>
         )}
+
+        {action}
       </div>
 
       {/* Values line: plain block-level text (not flex) so a long
@@ -137,18 +149,21 @@ function Section({
   selected,
   onToggle,
   onToggleAll,
+  renderAction,
 }: {
   tone: Tone
   records: RecordView[]
   selected?: Set<string>
   onToggle?: (key: string) => void
   onToggleAll?: (checked: boolean) => void
+  renderAction?: (record: RecordView) => ReactNode
 }) {
   const meta = TONE_META[tone]
   const Icon = meta.icon
-  // Read-only (NS/SOA) records are never selectable — only update/delete
-  // sections receive selection props from DiffView.
-  const selectable = tone !== "readonly" && !!selected && !!onToggle && !!onToggleAll
+  // Read-only (NS/SOA) and custom records are never selectable — only
+  // update/delete sections receive selection props from DiffView.
+  const selectable =
+    tone !== "readonly" && tone !== "custom" && !!selected && !!onToggle && !!onToggleAll
   const allSelected = selectable && records.length > 0 && records.every((r) => selected!.has(r.key))
   const someSelected = selectable && records.some((r) => selected!.has(r.key))
   const indeterminate = someSelected && !allSelected
@@ -191,6 +206,7 @@ function Section({
               tone={tone}
               checked={selectable ? selected!.has(record.key) : undefined}
               onToggle={selectable ? onToggle : undefined}
+              action={renderAction?.(record)}
             />
           ))}
         </div>
@@ -207,6 +223,8 @@ export function DiffView({
   onTogglePrune,
   onToggleAllUpdates,
   onToggleAllPrunes,
+  onMarkCustom,
+  onUnmarkCustom,
   footerExtra,
 }: {
   changeset: ChangesetResponse
@@ -216,6 +234,8 @@ export function DiffView({
   onTogglePrune: (key: string) => void
   onToggleAllUpdates: (checked: boolean) => void
   onToggleAllPrunes: (checked: boolean) => void
+  onMarkCustom?: (key: string) => void
+  onUnmarkCustom?: (key: string) => void
   footerExtra?: ReactNode
 }) {
   // Defensive: a field may arrive as null (e.g. a nil slice from an older
@@ -235,6 +255,36 @@ export function DiffView({
         selected={selectedPrunes}
         onToggle={onTogglePrune}
         onToggleAll={onToggleAllPrunes}
+        renderAction={
+          onMarkCustom &&
+          ((record) => (
+            <Button
+              variant="ghost"
+              size="icon-sm"
+              aria-label={`В customs ${record.type} ${record.name}`}
+              onClick={() => onMarkCustom(record.key)}
+            >
+              <BookmarkCheck className="size-3.5" strokeWidth={1.75} />
+            </Button>
+          ))
+        }
+      />
+      <Section
+        tone="custom"
+        records={changeset.customs ?? []}
+        renderAction={
+          onUnmarkCustom &&
+          ((record) => (
+            <Button
+              variant="ghost"
+              size="icon-sm"
+              aria-label={`Вернуть в дифф ${record.type} ${record.name}`}
+              onClick={() => onUnmarkCustom(record.key)}
+            >
+              <Undo2 className="size-3.5" strokeWidth={1.75} />
+            </Button>
+          ))
+        }
       />
       <Section tone="readonly" records={changeset.readOnly ?? []} />
 
diff --git a/web/src/index.css b/web/src/index.css
index 9f0905e..bcd7df4 100644
--- a/web/src/index.css
+++ b/web/src/index.css
@@ -43,6 +43,7 @@
     --color-diff-delete: var(--diff-delete);
     --color-diff-insync: var(--diff-insync);
     --color-diff-readonly: var(--diff-readonly);
+    --color-diff-custom: var(--diff-custom);
     --radius-sm: calc(var(--radius) * 0.6);
     --radius-md: calc(var(--radius) * 0.8);
     --radius-lg: var(--radius);
@@ -96,6 +97,7 @@
     --diff-delete: oklch(0.68 0.19 20); /* rose */
     --diff-insync: oklch(0.55 0.02 260); /* muted */
     --diff-readonly: oklch(0.5 0.02 260); /* dimmed */
+    --diff-custom: oklch(0.62 0.11 250); /* muted blue */
 }
 
 /* "Refined technical console" — dark by default (html.dark). Cool slate
@@ -139,6 +141,7 @@
     --diff-delete: oklch(0.68 0.19 20);
     --diff-insync: oklch(0.55 0.02 258);
     --diff-readonly: oklch(0.42 0.014 258);
+    --diff-custom: oklch(0.62 0.11 250);
 }
 
 @layer base {
diff --git a/web/src/pages/DomainDiffPage.test.tsx b/web/src/pages/DomainDiffPage.test.tsx
index 25d8516..930a61d 100644
--- a/web/src/pages/DomainDiffPage.test.tsx
+++ b/web/src/pages/DomainDiffPage.test.tsx
@@ -1,4 +1,4 @@
-import { render, screen, waitFor } from "@testing-library/react"
+import { render, screen, waitFor, within } from "@testing-library/react"
 import userEvent from "@testing-library/user-event"
 import { MemoryRouter, Routes, Route } from "react-router-dom"
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query"
@@ -173,3 +173,61 @@ test("создание шаблона из зоны вызывает templateFro
 
   await waitFor(() => expect(templateFromZoneSpy).toHaveBeenCalledWith(PROJECT_ID, "d1"))
 })
+
+test("кнопка «В customs» на строке prune вызывает api.addCustom с ключом записи", async () => {
+  const addSpy = vi.spyOn(api, "addCustom").mockResolvedValue(undefined)
+  vi.spyOn(api, "checkDomain").mockResolvedValue({
+    updates: [],
+    prunes: [
+      { key: "CNAME admin.example.com.", kind: "delete", type: "CNAME", name: "admin.example.com.", actual: ["example.com."], readOnly: false, custom: false },
+    ],
+    customs: [],
+    readOnly: [],
+    inSyncCount: 0,
+  })
+  const user = userEvent.setup()
+  renderPage()
+
+  await user.click(await screen.findByRole("button", { name: /в customs cname admin\.example\.com\./i }))
+
+  await waitFor(() =>
+    expect(addSpy).toHaveBeenCalledWith(PROJECT_ID, "d1", "CNAME admin.example.com."),
+  )
+})
+
+test("кнопка «Вернуть в дифф» на строке custom вызывает api.removeCustom", async () => {
+  const removeSpy = vi.spyOn(api, "removeCustom").mockResolvedValue(undefined)
+  vi.spyOn(api, "checkDomain").mockResolvedValue({
+    updates: [],
+    prunes: [],
+    customs: [
+      { key: "CNAME admin.example.com.", kind: "delete", type: "CNAME", name: "admin.example.com.", actual: ["example.com."], readOnly: false, custom: true },
+    ],
+    readOnly: [],
+    inSyncCount: 0,
+  })
+  const user = userEvent.setup()
+  renderPage()
+
+  await user.click(await screen.findByRole("button", { name: /вернуть в дифф cname admin\.example\.com\./i }))
+
+  await waitFor(() =>
+    expect(removeSpy).toHaveBeenCalledWith(PROJECT_ID, "d1", "CNAME admin.example.com."),
+  )
+})
+
+test("в секции customs нет чекбоксов — такие записи не применяются", async () => {
+  vi.spyOn(api, "checkDomain").mockResolvedValue({
+    updates: [],
+    prunes: [],
+    customs: [
+      { key: "CNAME admin.example.com.", kind: "delete", type: "CNAME", name: "admin.example.com.", actual: ["example.com."], readOnly: false, custom: true },
+    ],
+    readOnly: [],
+    inSyncCount: 0,
+  })
+  renderPage()
+
+  const section = await screen.findByRole("region", { name: /customs/i })
+  expect(within(section).queryByRole("checkbox")).toBeNull()
+})
diff --git a/web/src/pages/DomainDiffPage.tsx b/web/src/pages/DomainDiffPage.tsx
index eac410f..c12fd8d 100644
--- a/web/src/pages/DomainDiffPage.tsx
+++ b/web/src/pages/DomainDiffPage.tsx
@@ -13,10 +13,12 @@ import {
   TableRow,
 } from "@/components/ui/table"
 import {
+  useAddCustom,
   useApplyDomain,
   useCheckDomain,
   useCreateTemplateFromZone,
   useDomains,
+  useRemoveCustom,
   useZoneRecords,
 } from "@/hooks/useApi"
 import { cn } from "@/lib/utils"
@@ -29,6 +31,8 @@ export function DomainDiffPage() {
 
   const check = useCheckDomain(id, hasTemplate)
   const apply = useApplyDomain(id)
+  const addCustom = useAddCustom(id)
+  const removeCustom = useRemoveCustom(id)
   // Пока список доменов не загружен ИЛИ загрузка упала ошибкой, hasTemplate
   // недостоверно (false по умолчанию из-за domain === undefined) — не
   // дёргаем provider-запрос записей зоны, пока не будет точно известно
@@ -234,6 +238,8 @@ export function DomainDiffPage() {
             onTogglePrune={togglePrune}
             onToggleAllUpdates={toggleAllUpdates}
             onToggleAllPrunes={toggleAllPrunes}
+            onMarkCustom={(key) => addCustom.mutate(key)}
+            onUnmarkCustom={(key) => removeCustom.mutate(key)}
           />
 
           <div className="flex flex-col gap-3 rounded-xl border border-border bg-card/60 p-4">
@@ -275,6 +281,12 @@ export function DomainDiffPage() {
                 Apply
               </Button>
             </div>
+
+            {(addCustom.isError || removeCustom.isError) && (
+              <span role="alert" className="font-dns text-xs text-destructive">
+                {(addCustom.error ?? removeCustom.error)?.message}
+              </span>
+            )}
           </div>
         </>
       )}