diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98e6675489..3029a93b70 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,7 +18,7 @@
 - OAuth 2.0のサポート
 
 ### Client
--
+- Fix: サーバー情報画面(`/instance-info/{domain}`)でブロックができないのを修正
 
 ### Server
 -
diff --git a/packages/frontend/src/pages/instance-info.vue b/packages/frontend/src/pages/instance-info.vue
index 54f2cd7def..24355c0556 100644
--- a/packages/frontend/src/pages/instance-info.vue
+++ b/packages/frontend/src/pages/instance-info.vue
@@ -34,8 +34,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<FormSection v-if="iAmModerator">
 				<template #label>Moderation</template>
 				<div class="_gaps_s">
-					<MkSwitch v-model="suspended" @update:modelValue="toggleSuspend">{{ i18n.ts.stopActivityDelivery }}</MkSwitch>
-					<MkSwitch v-model="isBlocked" @update:modelValue="toggleBlock">{{ i18n.ts.blockThisInstance }}</MkSwitch>
+					<MkSwitch v-model="suspended" :disabled="!instance" @update:modelValue="toggleSuspend">{{ i18n.ts.stopActivityDelivery }}</MkSwitch>
+					<MkSwitch v-model="isBlocked" :disabled="!meta || !instance" @update:modelValue="toggleBlock">{{ i18n.ts.blockThisInstance }}</MkSwitch>
 					<MkButton @click="refreshMetadata"><i class="ti ti-refresh"></i> Refresh metadata</MkButton>
 				</div>
 			</FormSection>
@@ -129,7 +129,7 @@ import MkSelect from '@/components/MkSelect.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
 import * as os from '@/os';
 import number from '@/filters/number';
-import { iAmModerator } from '@/account';
+import { iAmModerator, iAmAdmin } from '@/account';
 import { definePageMetadata } from '@/scripts/page-metadata';
 import { i18n } from '@/i18n';
 import MkUserCardMini from '@/components/MkUserCardMini.vue';
@@ -143,11 +143,11 @@ const props = defineProps<{
 
 let tab = $ref('overview');
 let chartSrc = $ref('instance-requests');
-let meta = $ref<misskey.entities.DetailedInstanceMetadata | null>(null);
+let meta = $ref<misskey.entities.AdminInstanceMetadata | null>(null);
 let instance = $ref<misskey.entities.Instance | null>(null);
 let suspended = $ref(false);
 let isBlocked = $ref(false);
-let faviconUrl = $ref(null);
+let faviconUrl = $ref<string | null>(null);
 
 const usersPagination = {
 	endpoint: iAmModerator ? 'admin/show-users' : 'users' as const,
@@ -160,7 +160,10 @@ const usersPagination = {
 	offsetMode: true,
 };
 
-async function fetch() {
+async function fetch(): Promise<void> {
+	if (iAmAdmin) {
+		meta = await os.api('admin/meta');
+	}
 	instance = await os.api('federation/show-instance', {
 		host: props.host,
 	});
@@ -169,21 +172,25 @@ async function fetch() {
 	faviconUrl = getProxiedImageUrlNullable(instance.faviconUrl, 'preview') ?? getProxiedImageUrlNullable(instance.iconUrl, 'preview');
 }
 
-async function toggleBlock(ev) {
-	if (meta == null) return;
+async function toggleBlock(): Promise<void> {
+	if (!meta) throw new Error('No meta?');
+	if (!instance) throw new Error('No instance?');
+	const { host } = instance;
 	await os.api('admin/update-meta', {
-		blockedHosts: isBlocked ? meta.blockedHosts.concat([instance.host]) : meta.blockedHosts.filter(x => x !== instance.host),
+		blockedHosts: isBlocked ? meta.blockedHosts.concat([host]) : meta.blockedHosts.filter(x => x !== host),
 	});
 }
 
-async function toggleSuspend(v) {
+async function toggleSuspend(): Promise<void> {
+	if (!instance) throw new Error('No instance?');
 	await os.api('admin/federation/update-instance', {
 		host: instance.host,
 		isSuspended: suspended,
 	});
 }
 
-function refreshMetadata() {
+function refreshMetadata(): void {
+	if (!instance) throw new Error('No instance?');
 	os.api('admin/federation/refresh-remote-instance-metadata', {
 		host: instance.host,
 	});
diff --git a/packages/misskey-js/etc/misskey-js.api.md b/packages/misskey-js/etc/misskey-js.api.md
index 65d6e2e0b1..9d872f98e7 100644
--- a/packages/misskey-js/etc/misskey-js.api.md
+++ b/packages/misskey-js/etc/misskey-js.api.md
@@ -17,6 +17,11 @@ export type Acct = {
 // @public (undocumented)
 type Ad = TODO_2;
 
+// @public (undocumented)
+type AdminInstanceMetadata = DetailedInstanceMetadata & {
+    blockedHosts: string[];
+};
+
 // @public (undocumented)
 type Announcement = {
     id: ID;
@@ -329,8 +334,8 @@ export type Endpoints = {
         res: TODO;
     };
     'admin/meta': {
-        req: TODO;
-        res: TODO;
+        req: NoParams;
+        res: AdminInstanceMetadata;
     };
     'admin/reset-password': {
         req: TODO;
@@ -2226,6 +2231,7 @@ declare namespace entities {
         LiteInstanceMetadata,
         DetailedInstanceMetadata,
         InstanceMetadata,
+        AdminInstanceMetadata,
         ServerInfo,
         Stats,
         Page,
@@ -2317,7 +2323,7 @@ type ID = string;
 // @public (undocumented)
 type Instance = {
     id: ID;
-    caughtAt: DateString;
+    firstRetrievedAt: DateString;
     host: string;
     usersCount: number;
     notesCount: number;
@@ -2331,6 +2337,7 @@ type Instance = {
     lastCommunicatedAt: DateString;
     isNotResponding: boolean;
     isSuspended: boolean;
+    isBlocked: boolean;
     softwareName: string | null;
     softwareVersion: string | null;
     openRegistrations: boolean | null;
diff --git a/packages/misskey-js/src/api.types.ts b/packages/misskey-js/src/api.types.ts
index 343977f4be..de9af99168 100644
--- a/packages/misskey-js/src/api.types.ts
+++ b/packages/misskey-js/src/api.types.ts
@@ -2,7 +2,7 @@ import type {
 	Ad, Announcement, Antenna, App, AuthSession, Blocking, Channel, Clip, DateString, DetailedInstanceMetadata, DriveFile, DriveFolder, Following, FollowingFolloweePopulated, FollowingFollowerPopulated, FollowRequest, GalleryPost, Instance,
 	LiteInstanceMetadata,
 	MeDetailed,
-	Note, NoteFavorite, OriginType, Page, ServerInfo, Stats, User, UserDetailed, MeSignup, UserGroup, UserList, UserSorting, Notification, NoteReaction, Signin, MessagingMessage, Invite, InviteLimit,
+	Note, NoteFavorite, OriginType, Page, ServerInfo, Stats, User, UserDetailed, MeSignup, UserGroup, UserList, UserSorting, Notification, NoteReaction, Signin, MessagingMessage, Invite, InviteLimit, AdminInstanceMetadata,
 } from './entities.js';
 
 type TODO = Record<string, any> | null;
@@ -20,7 +20,7 @@ export type Endpoints = {
 	'admin/get-table-stats': { req: TODO; res: TODO; };
 	'admin/invite': { req: TODO; res: TODO; };
 	'admin/logs': { req: TODO; res: TODO; };
-	'admin/meta': { req: TODO; res: TODO; };
+	'admin/meta': { req: NoParams; res: AdminInstanceMetadata; };
 	'admin/reset-password': { req: TODO; res: TODO; };
 	'admin/resolve-abuse-user-report': { req: TODO; res: TODO; };
 	'admin/resync-chart': { req: TODO; res: TODO; };
diff --git a/packages/misskey-js/src/entities.ts b/packages/misskey-js/src/entities.ts
index ea85bedf63..b9771d1964 100644
--- a/packages/misskey-js/src/entities.ts
+++ b/packages/misskey-js/src/entities.ts
@@ -346,6 +346,11 @@ export type DetailedInstanceMetadata = LiteInstanceMetadata & {
 
 export type InstanceMetadata = LiteInstanceMetadata | DetailedInstanceMetadata;
 
+export type AdminInstanceMetadata = DetailedInstanceMetadata & {
+	// TODO: There are more fields.
+	blockedHosts: string[];
+};
+
 export type ServerInfo = {
 	machine: string;
 	cpu: {
@@ -482,7 +487,7 @@ export type Blocking = {
 
 export type Instance = {
 	id: ID;
-	caughtAt: DateString;
+	firstRetrievedAt: DateString;
 	host: string;
 	usersCount: number;
 	notesCount: number;
@@ -496,6 +501,7 @@ export type Instance = {
 	lastCommunicatedAt: DateString;
 	isNotResponding: boolean;
 	isSuspended: boolean;
+	isBlocked: boolean;
 	softwareName: string | null;
 	softwareVersion: string | null;
 	openRegistrations: boolean | null;