diff --git a/packages/backend/migration/1692374635734-IncreaseHostCharLimit.js b/packages/backend/migration/1692374635734-IncreaseHostCharLimit.js
new file mode 100644
index 0000000000..feb0d18a63
--- /dev/null
+++ b/packages/backend/migration/1692374635734-IncreaseHostCharLimit.js
@@ -0,0 +1,119 @@
+export class IncreaseHostCharLimit1692374635734 {
+	name = "IncreaseHostCharLimit1692374635734";
+
+	async up(queryRunner) {
+		await queryRunner.query(
+			`ALTER TABLE "drive_file" ALTER COLUMN "userHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "user" ALTER COLUMN "host" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "user_profile" ALTER COLUMN "userHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "user_publickey" ALTER COLUMN "keyId" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "emoji" ALTER COLUMN "host" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "note" ALTER COLUMN "userHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "note" ALTER COLUMN "replyUserHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "note" ALTER COLUMN "renoteUserHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "instance" ALTER COLUMN "host" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "instance" ALTER COLUMN "iconUrl" TYPE character varying(4096)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "instance" ALTER COLUMN "faviconUrl" TYPE character varying(4096)`,
+		);
+
+		await queryRunner.query(
+			`ALTER TABLE "poll" ALTER COLUMN "userHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "abuse_user_report" ALTER COLUMN "targetUserHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "abuse_user_report" ALTER COLUMN "reporterHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "following" ALTER COLUMN "followeeHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "following" ALTER COLUMN "followerHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "follow_request" ALTER COLUMN "followeeHost" TYPE character varying(512)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "follow_request" ALTER COLUMN "followerHost" TYPE character varying(512)`,
+		);
+	}
+
+	async down(queryRunner) {
+		await queryRunner.query(
+			`ALTER TABLE "drive_file" ALTER COLUMN "userHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "user" ALTER COLUMN "host" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "user_profile" ALTER COLUMN "userHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "user_publickey" ALTER COLUMN "keyId" TYPE character varying(256)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "emoji" ALTER COLUMN "host" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "note" ALTER COLUMN "userHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "note" ALTER COLUMN "replyUserHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "note" ALTER COLUMN "renoteUserHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "instance" ALTER COLUMN "host" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "instance" ALTER COLUMN "iconUrl" TYPE character varying(256)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "instance" ALTER COLUMN "faviconUrl" TYPE character varying(256)`,
+		);
+
+		await queryRunner.query(
+			`ALTER TABLE "poll" ALTER COLUMN "userHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "abuse_user_report" ALTER COLUMN "targetUserHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "abuse_user_report" ALTER COLUMN "reporterHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "following" ALTER COLUMN "followeeHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "following" ALTER COLUMN "followerHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "follow_request" ALTER COLUMN "followeeHost" TYPE character varying(128)`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "follow_request" ALTER COLUMN "followerHost" TYPE character varying(128)`,
+		);
+	}
+}
diff --git a/packages/backend/src/models/entities/abuse-user-report.ts b/packages/backend/src/models/entities/abuse-user-report.ts
index be183548d8..cb4d55851d 100644
--- a/packages/backend/src/models/entities/abuse-user-report.ts
+++ b/packages/backend/src/models/entities/abuse-user-report.ts
@@ -71,7 +71,7 @@ export class AbuseUserReport {
 	//#region Denormalized fields
 	@Index()
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment: "[Denormalized]",
 	})
@@ -79,7 +79,7 @@ export class AbuseUserReport {
 
 	@Index()
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment: "[Denormalized]",
 	})
diff --git a/packages/backend/src/models/entities/drive-file.ts b/packages/backend/src/models/entities/drive-file.ts
index d8b54fa194..da93f32a82 100644
--- a/packages/backend/src/models/entities/drive-file.ts
+++ b/packages/backend/src/models/entities/drive-file.ts
@@ -39,7 +39,7 @@ export class DriveFile {
 
 	@Index()
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment: "The host of owner. It will be null if the user in local.",
 	})
diff --git a/packages/backend/src/models/entities/emoji.ts b/packages/backend/src/models/entities/emoji.ts
index 727ba2f10a..87b525dc59 100644
--- a/packages/backend/src/models/entities/emoji.ts
+++ b/packages/backend/src/models/entities/emoji.ts
@@ -20,7 +20,7 @@ export class Emoji {
 
 	@Index()
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 	})
 	public host: string | null;
diff --git a/packages/backend/src/models/entities/following.ts b/packages/backend/src/models/entities/following.ts
index fafcf88851..ea8f325650 100644
--- a/packages/backend/src/models/entities/following.ts
+++ b/packages/backend/src/models/entities/following.ts
@@ -50,7 +50,7 @@ export class Following {
 	//#region Denormalized fields
 	@Index()
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment: "[Denormalized]",
 	})
@@ -72,7 +72,7 @@ export class Following {
 
 	@Index()
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment: "[Denormalized]",
 	})
diff --git a/packages/backend/src/models/entities/instance.ts b/packages/backend/src/models/entities/instance.ts
index 7e0b085831..7b7701d07d 100644
--- a/packages/backend/src/models/entities/instance.ts
+++ b/packages/backend/src/models/entities/instance.ts
@@ -20,7 +20,7 @@ export class Instance {
 	 */
 	@Index({ unique: true })
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		comment: "The host of the Instance.",
 	})
 	public host: string;
@@ -149,13 +149,13 @@ export class Instance {
 	public maintainerEmail: string | null;
 
 	@Column("varchar", {
-		length: 256,
+		length: 4096,
 		nullable: true,
 	})
 	public iconUrl: string | null;
 
 	@Column("varchar", {
-		length: 256,
+		length: 4096,
 		nullable: true,
 	})
 	public faviconUrl: string | null;
diff --git a/packages/backend/src/models/entities/note.ts b/packages/backend/src/models/entities/note.ts
index edcfdb635e..21fe64e901 100644
--- a/packages/backend/src/models/entities/note.ts
+++ b/packages/backend/src/models/entities/note.ts
@@ -217,7 +217,7 @@ export class Note {
 	//#region Denormalized fields
 	@Index()
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment: "[Denormalized]",
 	})
@@ -231,7 +231,7 @@ export class Note {
 	public replyUserId: User["id"] | null;
 
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment: "[Denormalized]",
 	})
@@ -245,7 +245,7 @@ export class Note {
 	public renoteUserId: User["id"] | null;
 
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment: "[Denormalized]",
 	})
diff --git a/packages/backend/src/models/entities/poll.ts b/packages/backend/src/models/entities/poll.ts
index 405cca2225..c117d4e733 100644
--- a/packages/backend/src/models/entities/poll.ts
+++ b/packages/backend/src/models/entities/poll.ts
@@ -58,7 +58,7 @@ export class Poll {
 
 	@Index()
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment: "[Denormalized]",
 	})
diff --git a/packages/backend/src/models/entities/user-profile.ts b/packages/backend/src/models/entities/user-profile.ts
index 002247d3a3..686fab3439 100644
--- a/packages/backend/src/models/entities/user-profile.ts
+++ b/packages/backend/src/models/entities/user-profile.ts
@@ -242,7 +242,7 @@ export class UserProfile {
 	//#region Denormalized fields
 	@Index()
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment: "[Denormalized]",
 	})
diff --git a/packages/backend/src/models/entities/user-publickey.ts b/packages/backend/src/models/entities/user-publickey.ts
index 83a86b8a3a..e39b084d32 100644
--- a/packages/backend/src/models/entities/user-publickey.ts
+++ b/packages/backend/src/models/entities/user-publickey.ts
@@ -22,7 +22,7 @@ export class UserPublickey {
 
 	@Index({ unique: true })
 	@Column("varchar", {
-		length: 256,
+		length: 512,
 	})
 	public keyId: string;
 
diff --git a/packages/backend/src/models/entities/user.ts b/packages/backend/src/models/entities/user.ts
index ddad9f3b23..6bbd939b5c 100644
--- a/packages/backend/src/models/entities/user.ts
+++ b/packages/backend/src/models/entities/user.ts
@@ -201,7 +201,7 @@ export class User {
 
 	@Index()
 	@Column("varchar", {
-		length: 128,
+		length: 512,
 		nullable: true,
 		comment:
 			"The host of the User. It will be null if the origin of the user is local.",