diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index a6148a62d9..f052d4ed80 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1384,6 +1384,7 @@ admin/views/federation.vue:
   remove-all-following: "フォローを全解除"
   remove-all-following-info: "{host}からのフォローをすべて解除します。そのインスタンスがもう存在しなくなった場合などに実行してください。"
   block: "ブロック"
+  marked-as-closed: "閉鎖されているとマーク"
   lookup: "照会"
   instances: "インスタンス"
   instance-not-registered: "そのインスタンスは登録されていません"
@@ -1391,6 +1392,8 @@ admin/views/federation.vue:
   sorts:
     caughtAtAsc: "登録日時が古い順"
     caughtAtDesc: "登録日時が新しい順"
+    lastCommunicatedAtAsc: "最後にやり取りした日時が古い順"
+    lastCommunicatedAtDesc: "最後にやり取りした日時が新しい順"
     notesAsc: "投稿が少ない順"
     notesDesc: "投稿が多い順"
     usersAsc: "ユーザーが少ない順"
@@ -1407,6 +1410,8 @@ admin/views/federation.vue:
   states:
     all: "すべて"
     blocked: "ブロック"
+    not-responding: "応答なし"
+    marked-as-closed: "閉鎖とマーク済み"
   result-is-truncated: "上位{n}件を表示しています。"
   charts: "チャート"
   chart-srcs:
diff --git a/src/client/app/admin/views/federation.vue b/src/client/app/admin/views/federation.vue
index 8b0e9ba45a..b60ce89241 100644
--- a/src/client/app/admin/views/federation.vue
+++ b/src/client/app/admin/views/federation.vue
@@ -40,6 +40,7 @@
 					<span>{{ $t('latest-request-received-at') }}</span>
 				</ui-input>
 				<ui-switch v-model="instance.isBlocked" @change="updateInstance()">{{ $t('block') }}</ui-switch>
+				<ui-switch v-model="instance.isMarkedAsClosed" @change="updateInstance()">{{ $t('marked-as-closed') }}</ui-switch>
 				<details>
 					<summary>{{ $t('charts') }}</summary>
 					<ui-horizon-group inputs>
@@ -80,6 +81,8 @@
 					<span slot="label">{{ $t('sort') }}</span>
 					<option value="-caughtAt">{{ $t('sorts.caughtAtAsc') }}</option>
 					<option value="+caughtAt">{{ $t('sorts.caughtAtDesc') }}</option>
+					<option value="-lastCommunicatedAt">{{ $t('sorts.lastCommunicatedAtAsc') }}</option>
+					<option value="+lastCommunicatedAt">{{ $t('sorts.lastCommunicatedAtDesc') }}</option>
 					<option value="-notes">{{ $t('sorts.notesAsc') }}</option>
 					<option value="+notes">{{ $t('sorts.notesDesc') }}</option>
 					<option value="-users">{{ $t('sorts.usersAsc') }}</option>
@@ -97,6 +100,8 @@
 					<span slot="label">{{ $t('state') }}</span>
 					<option value="all">{{ $t('states.all') }}</option>
 					<option value="blocked">{{ $t('states.blocked') }}</option>
+					<option value="notResponding">{{ $t('states.not-responding') }}</option>
+					<option value="markedAsClosed">{{ $t('states.marked-as-closed') }}</option>
 				</ui-select>
 			</ui-horizon-group>
 
@@ -247,7 +252,9 @@ export default Vue.extend({
 		fetchInstances() {
 			this.instances = [];
 			this.$root.api('federation/instances', {
-				state: this.state,
+				blocked: this.state === 'blocked' ? true : null,
+				notResponding: this.state === 'notResponding' ? true : null,
+				markedAsClosed: this.state === 'markedAsClosed' ? true : null,
 				sort: this.sort,
 				limit: this.limit
 			}).then(instances => {
@@ -269,7 +276,8 @@ export default Vue.extend({
 		updateInstance() {
 			this.$root.api('admin/federation/update-instance', {
 				host: this.instance.host,
-				isBlocked: this.instance.isBlocked,
+				isBlocked: this.instance.isBlocked || false,
+				isClosed: this.instance.isMarkedAsClosed || false
 			});
 		},
 
diff --git a/src/models/instance.ts b/src/models/instance.ts
index 985564f8de..cdce570a4b 100644
--- a/src/models/instance.ts
+++ b/src/models/instance.ts
@@ -68,8 +68,23 @@ export interface IInstance {
 	 */
 	latestRequestReceivedAt?: Date;
 
+	/**
+	 * このインスタンスと不通かどうか
+	 */
+	isNotResponding: boolean;
+
+	/**
+	 * このインスタンスと最後にやり取りした日時
+	 */
+	lastCommunicatedAt: Date;
+
 	/**
 	 * このインスタンスをブロックしているか
 	 */
 	isBlocked: boolean;
+
+	/**
+	 * このインスタンスが閉鎖済みとしてマークされているか
+	 */
+	isMarkedAsClosed: boolean;
 }
diff --git a/src/queue/processors/http/deliver.ts b/src/queue/processors/http/deliver.ts
index 6d24cd2634..1ba582a284 100644
--- a/src/queue/processors/http/deliver.ts
+++ b/src/queue/processors/http/deliver.ts
@@ -17,7 +17,9 @@ export default async (job: bq.Job, done: any): Promise<void> => {
 			Instance.update({ _id: i._id }, {
 				$set: {
 					latestRequestSentAt: new Date(),
-					latestStatus: 200
+					latestStatus: 200,
+					lastCommunicatedAt: new Date(),
+					isNotResponding: false
 				}
 			});
 
@@ -31,7 +33,8 @@ export default async (job: bq.Job, done: any): Promise<void> => {
 			Instance.update({ _id: i._id }, {
 				$set: {
 					latestRequestSentAt: new Date(),
-					latestStatus: res != null && res.hasOwnProperty('statusCode') ? res.statusCode : null
+					latestStatus: res != null && res.hasOwnProperty('statusCode') ? res.statusCode : null,
+					isNotResponding: true
 				}
 			});
 
diff --git a/src/queue/processors/http/process-inbox.ts b/src/queue/processors/http/process-inbox.ts
index 07d4b5ba71..43170848f9 100644
--- a/src/queue/processors/http/process-inbox.ts
+++ b/src/queue/processors/http/process-inbox.ts
@@ -126,7 +126,9 @@ export default async (job: bq.Job, done: any): Promise<void> => {
 	registerOrFetchInstanceDoc(user.host).then(i => {
 		Instance.update({ _id: i._id }, {
 			$set: {
-				latestRequestReceivedAt: new Date()
+				latestRequestReceivedAt: new Date(),
+				lastCommunicatedAt: new Date(),
+				isNotResponding: false
 			}
 		});
 
diff --git a/src/server/api/endpoints/admin/federation/update-instance.ts b/src/server/api/endpoints/admin/federation/update-instance.ts
index de40480a49..579b437aa1 100644
--- a/src/server/api/endpoints/admin/federation/update-instance.ts
+++ b/src/server/api/endpoints/admin/federation/update-instance.ts
@@ -14,6 +14,10 @@ export const meta = {
 		isBlocked: {
 			validator: $.bool
 		},
+
+		isClosed: {
+			validator: $.bool
+		},
 	}
 };
 
@@ -26,7 +30,8 @@ export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 
 	Instance.update({ host: ps.host }, {
 		$set: {
-			isBlocked: ps.isBlocked
+			isBlocked: ps.isBlocked,
+			isMarkedAsClosed: ps.isClosed
 		}
 	});
 
diff --git a/src/server/api/endpoints/federation/instances.ts b/src/server/api/endpoints/federation/instances.ts
index 9b4efbaaff..9c1e57ee16 100644
--- a/src/server/api/endpoints/federation/instances.ts
+++ b/src/server/api/endpoints/federation/instances.ts
@@ -6,8 +6,16 @@ export const meta = {
 	requireCredential: false,
 
 	params: {
-		state: {
-			validator: $.str.optional,
+		blocked: {
+			validator: $.bool.optional.nullable,
+		},
+
+		notResponding: {
+			validator: $.bool.optional.nullable,
+		},
+
+		markedAsClosed: {
+			validator: $.bool.optional.nullable,
 		},
 
 		limit: {
@@ -70,6 +78,14 @@ export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 			sort = {
 				caughtAt: 1
 			};
+		} else if (ps.sort == '+lastCommunicatedAt') {
+			sort = {
+				lastCommunicatedAt: -1
+			};
+		} else if (ps.sort == '-lastCommunicatedAt') {
+			sort = {
+				lastCommunicatedAt: 1
+			};
 		} else if (ps.sort == '+driveUsage') {
 			sort = {
 				driveUsage: -1
@@ -95,9 +111,9 @@ export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 
 	const q = {} as any;
 
-	if (ps.state === 'blocked') {
-		q.isBlocked = true;
-	}
+	if (typeof ps.blocked === 'boolean') q.isBlocked = ps.blocked;
+	if (typeof ps.notResponding === 'boolean') q.isNotResponding = ps.notResponding;
+	if (typeof ps.markedAsClosed === 'boolean') q.isMarkedAsClosed = ps.markedAsClosed;
 
 	const instances = await Instance
 		.find(q, {