diff --git a/locales/en-US.yml b/locales/en-US.yml
index 2f855ef9eb..7e24a62022 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -265,6 +265,9 @@ noCustomEmojis: "There are no emoji"
 noJobs: "There are no jobs"
 federating: "Federating"
 blocked: "Blocked"
+blockedByBase: "This host is blocked implicitly because a base domain is blocked. To unblock this host, first unblock the base domain(s)."
+silencedByBase: "This host is silenced implicitly because a base domain is silenced. To un-silence this host, first un-silence the base domain(s)."
+mediaSilencedByBase: "This host's media is silenced implicitly because a base domain's media is silenced. To un-silence this host, first un-silence the base domain(s)."
 suspended: "Suspended"
 all: "All"
 subscribing: "Subscribing"
diff --git a/locales/index.d.ts b/locales/index.d.ts
index 8a17705600..9a02dbc1e2 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -1076,6 +1076,18 @@ export interface Locale extends ILocale {
      * ブロック中
      */
     "blocked": string;
+    /**
+     * This host is blocked implicitly because a base domain is blocked. To unblock this host, first unblock the base domain(s).
+     */
+    "blockedByBase": string;
+    /**
+     * This host is silenced implicitly because a base domain is silenced. To un-silence this host, first un-silence the base domain(s).
+     */
+    "silencedByBase": string;
+    /**
+     * This host's media is silenced implicitly because a base domain's media is silenced. To un-silence this host, first un-silence the base domain(s).
+     */
+    "mediaSilencedByBase": string;
     /**
      * 配信停止
      */
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 724e9a23a1..c422172eb9 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -265,6 +265,9 @@ noCustomEmojis: "絵文字はありません"
 noJobs: "ジョブはありません"
 federating: "連合中"
 blocked: "ブロック中"
+blockedByBase: "This host is blocked implicitly because a base domain is blocked. To unblock this host, first unblock the base domain(s)."
+silencedByBase: "This host is silenced implicitly because a base domain is silenced. To un-silence this host, first un-silence the base domain(s)."
+mediaSilencedByBase: "This host's media is silenced implicitly because a base domain's media is silenced. To un-silence this host, first un-silence the base domain(s)."
 suspended: "配信停止"
 all: "全て"
 subscribing: "購読中"
diff --git a/packages/backend/src/server/api/endpoints/admin/meta.ts b/packages/backend/src/server/api/endpoints/admin/meta.ts
index 5a69fbf679..dbfa31024a 100644
--- a/packages/backend/src/server/api/endpoints/admin/meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/meta.ts
@@ -128,7 +128,7 @@ export const meta = {
 			},
 			silencedHosts: {
 				type: 'array',
-				optional: true,
+				optional: false,
 				nullable: false,
 				items: {
 					type: 'string',
diff --git a/packages/frontend/src/pages/instance-info.vue b/packages/frontend/src/pages/instance-info.vue
index 4ff26197d8..821cd599eb 100644
--- a/packages/frontend/src/pages/instance-info.vue
+++ b/packages/frontend/src/pages/instance-info.vue
@@ -45,10 +45,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 						</MkKeyValue>
 						<MkButton v-if="suspensionState === 'none'" :disabled="!instance" danger @click="stopDelivery">{{ i18n.ts._delivery.stop }}</MkButton>
 						<MkButton v-if="suspensionState !== 'none'" :disabled="!instance" @click="resumeDelivery">{{ i18n.ts._delivery.resume }}</MkButton>
-						<MkSwitch v-model="isBlocked" :disabled="!meta || !instance" @update:modelValue="toggleBlock">{{ i18n.ts.blockThisInstance }}</MkSwitch>
-						<MkSwitch v-model="isSilenced" :disabled="!meta || !instance" @update:modelValue="toggleSilenced">{{ i18n.ts.silenceThisInstance }}</MkSwitch>
+						<MkInfo v-if="isBaseBlocked" warn>{{ i18n.ts.blockedByBase }}</MkInfo>
+						<MkSwitch v-model="isBlocked" :disabled="!meta || !instance || isBaseBlocked" @update:modelValue="toggleBlock">{{ i18n.ts.blockThisInstance }}</MkSwitch>
+						<MkInfo v-if="isBaseSilenced" warn>{{ i18n.ts.silencedByBase }}</MkInfo>
+						<MkSwitch v-model="isSilenced" :disabled="!meta || !instance || isBaseSilenced" @update:modelValue="toggleSilenced">{{ i18n.ts.silenceThisInstance }}</MkSwitch>
 						<MkSwitch v-model="isNSFW" :disabled="!instance" @update:modelValue="toggleNSFW">Mark as NSFW</MkSwitch>
-						<MkSwitch v-model="isMediaSilenced" :disabled="!meta || !instance" @update:modelValue="toggleMediaSilenced">{{ i18n.ts.mediaSilenceThisInstance }}</MkSwitch>
+						<MkInfo v-if="isBaseMediaSilenced" warn>{{ i18n.ts.mediaSilencedByBase }}</MkInfo>
+						<MkSwitch v-model="isMediaSilenced" :disabled="!meta || !instance || isBaseMediaSilenced" @update:modelValue="toggleMediaSilenced">{{ i18n.ts.mediaSilenceThisInstance }}</MkSwitch>
 						<MkButton @click="refreshMetadata"><i class="ti ti-refresh"></i> Refresh metadata</MkButton>
 						<MkTextarea v-model="moderationNote" manualSave>
 							<template #label>{{ i18n.ts.moderationNote }}</template>
@@ -156,6 +159,7 @@ import MkHorizontalSwipe from '@/components/MkHorizontalSwipe.vue';
 import { getProxiedImageUrlNullable } from '@/scripts/media-proxy.js';
 import { dateString } from '@/filters/date.js';
 import MkTextarea from '@/components/MkTextarea.vue';
+import MkInfo from '@/components/MkInfo.vue';
 
 const props = defineProps<{
 	host: string;
@@ -174,6 +178,21 @@ const isMediaSilenced = ref(false);
 const faviconUrl = ref<string | null>(null);
 const moderationNote = ref('');
 
+const baseDomains = computed(() => {
+	const domains: string[] = [];
+
+	const parts = props.host.toLowerCase().split('.');
+	for (let s = 1; s < parts.length; s++) {
+		const domain = parts.slice(s).join('.');
+		domains.push(domain);
+	}
+
+	return domains;
+});
+const isBaseBlocked = computed(() => meta.value && baseDomains.value.some(d => meta.value?.blockedHosts.includes(d)));
+const isBaseSilenced = computed(() => meta.value && baseDomains.value.some(d => meta.value?.silencedHosts.includes(d)));
+const isBaseMediaSilenced = computed(() => meta.value && baseDomains.value.some(d => meta.value?.mediaSilencedHosts.includes(d)));
+
 const usersPagination = {
 	endpoint: iAmModerator ? 'admin/show-users' : 'users' as const,
 	limit: 10,
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 0e83bdfcca..e3bf828982 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -5199,7 +5199,7 @@ export type operations = {
             enableEmail: boolean;
             enableServiceWorker: boolean;
             translatorAvailable: boolean;
-            silencedHosts?: string[];
+            silencedHosts: string[];
             mediaSilencedHosts: string[];
             pinnedUsers: string[];
             hiddenTags: string[];