diff --git a/backend/alembic/versions/0013_device_last_ping_at.py b/backend/alembic/versions/0013_device_last_ping_at.py
new file mode 100644
index 0000000..feae731
--- /dev/null
+++ b/backend/alembic/versions/0013_device_last_ping_at.py
@@ -0,0 +1,25 @@
+"""device last_ping_at
+
+Revision ID: 0013
+Revises: 0012
+Create Date: 2026-04-10
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "0013"
+down_revision = "0012"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "devices",
+        sa.Column("last_ping_at", sa.DateTime(timezone=True), nullable=True),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("devices", "last_ping_at")
diff --git a/backend/app/models/device.py b/backend/app/models/device.py
index 54a2da6..3aa22c5 100644
--- a/backend/app/models/device.py
+++ b/backend/app/models/device.py
@@ -78,6 +78,7 @@ class Device(Base, TimestampMixin):
 
     # Monitoring
     monitor_enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
+    last_ping_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)
     last_seen: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)
     last_ping_ms: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
     status: Mapped[str] = mapped_column(String(20), nullable=False, default="unknown")
diff --git a/backend/app/schemas/device.py b/backend/app/schemas/device.py
index 46da3a1..05521a6 100644
--- a/backend/app/schemas/device.py
+++ b/backend/app/schemas/device.py
@@ -81,6 +81,7 @@ class DeviceRead(BaseModel):
     device_meta: dict[str, Any] = {}
     capabilities: list[str] = []
     monitor_enabled: bool
+    last_ping_at: Optional[datetime] = None
     last_seen: Optional[datetime] = None
     last_ping_ms: Optional[int] = None
     status: str
diff --git a/backend/app/workers/monitor.py b/backend/app/workers/monitor.py
index f84a61e..9501448 100644
--- a/backend/app/workers/monitor.py
+++ b/backend/app/workers/monitor.py
@@ -112,6 +112,7 @@ async def _check_device(
                 return
 
             device.status = new_status
+            device.last_ping_at = now
             if success:
                 device.last_seen = now
                 device.last_ping_ms = ping_ms
diff --git a/frontend/src/api/objects.ts b/frontend/src/api/objects.ts
index 8931d78..0d43d56 100644
--- a/frontend/src/api/objects.ts
+++ b/frontend/src/api/objects.ts
@@ -49,9 +49,10 @@ export interface DeviceItem {
   connection_params: Record<string, unknown>
   capabilities: string[]
   status: string
+  monitor_enabled: boolean
+  last_ping_at: string | null
   last_seen: string | null
   last_ping_ms: number | null
-  monitor_enabled: boolean
   is_active: boolean
   notes: string | null
   created_at: string
diff --git a/frontend/src/pages/ObjectDetail.tsx b/frontend/src/pages/ObjectDetail.tsx
index ec282a1..94c580c 100644
--- a/frontend/src/pages/ObjectDetail.tsx
+++ b/frontend/src/pages/ObjectDetail.tsx
@@ -427,19 +427,50 @@ export function ObjectDetailPage({ defaultMode = 'inventory' }: { defaultMode?:
         row._type === 'group' ? null : <DeviceStatusBadge status={(row as DeviceRow).status} />,
     },
     {
-      title: 'Последний ping',
-      dataIndex: 'last_seen',
-      key: 'last_seen',
+      title: 'Мониторинг',
+      key: 'monitoring',
       onCell: (row: TableRow) => row._type === 'group' ? { colSpan: 0 } : {},
       render: (_: unknown, row: TableRow) => {
         if (row._type === 'group') return null
         const d = row as DeviceRow
-        if (!d.last_seen) return '—'
+
+        // Мониторинг выключен и история отсутствует
+        if (!d.monitor_enabled && !d.last_ping_at) {
+          return <Typography.Text type="secondary">выключен</Typography.Text>
+        }
+
+        // Мониторинг включён, но ни разу не пинговалось
+        if (d.monitor_enabled && !d.last_ping_at) {
+          return <Typography.Text type="secondary">ожидание...</Typography.Text>
+        }
+
+        const pauseIcon = !d.monitor_enabled
+          ? <Tooltip title="Мониторинг выключен"><span style={{ color: '#faad14', marginLeft: 4 }}>⏸</span></Tooltip>
+          : null
+
+        // Устройство online — last_ping_at ≈ last_seen
+        if (d.status === 'online') {
+          return (
+            <Tooltip title={elapsedAgo(d.last_ping_at!)}>
+              <span style={{ color: '#52c41a', cursor: 'default' }}>
+                {dayjs(d.last_ping_at).format('DD.MM.YYYY HH:mm')}
+              </span>
+              {pauseIcon}
+            </Tooltip>
+          )
+        }
+
+        // Устройство offline или unknown — показываем время попытки, в tooltip — когда был онлайн
+        const lastSeenHint = d.last_seen
+          ? `онлайн был: ${dayjs(d.last_seen).format('DD.MM.YYYY HH:mm')}`
+          : 'онлайн не был'
+
         return (
-          <Tooltip title={elapsedAgo(d.last_seen)}>
-            <span style={{ cursor: 'default' }}>
-              {dayjs(d.last_seen).format('DD.MM.YYYY HH:mm')}
+          <Tooltip title={`${elapsedAgo(d.last_ping_at!)} · ${lastSeenHint}`}>
+            <span style={{ color: '#ff4d4f', cursor: 'default' }}>
+              {dayjs(d.last_ping_at).format('DD.MM.YYYY HH:mm')}
             </span>
+            {pauseIcon}
           </Tooltip>
         )
       },