diff --git a/Cargo.lock b/Cargo.lock
index 9eb270683..09485efa6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -633,6 +633,19 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "cidr-utils"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "355d5b5df67e58b523953d0c1a8d3d2c05f5af51f1332b0199b9c92263614ed0"
+dependencies = [
+ "debug-helper",
+ "num-bigint",
+ "num-traits 0.2.15",
+ "once_cell",
+ "regex",
+]
+
 [[package]]
 name = "clang-sys"
 version = "1.3.3"
@@ -1244,6 +1257,12 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7046468a81e6a002061c01e6a7c83139daf91b11c30e66795b13217c2d885c8b"
 
+[[package]]
+name = "debug-helper"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f578e8e2c440e7297e008bb5486a3a8a194775224bbc23729b0dbdfaeebf162e"
+
 [[package]]
 name = "default-net"
 version = "0.11.0"
@@ -3291,6 +3310,17 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "num-bigint"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f93ab6289c7b344a8a9f60f88d80aa20032336fe78da341afc91c8a2341fc75f"
+dependencies = [
+ "autocfg 1.1.0",
+ "num-integer",
+ "num-traits 0.2.15",
+]
+
 [[package]]
 name = "num-complex"
 version = "0.4.2"
@@ -4375,6 +4405,7 @@ dependencies = [
  "cc",
  "cfg-if 1.0.0",
  "chrono",
+ "cidr-utils",
  "clap 3.2.17",
  "clipboard",
  "cocoa",
diff --git a/Cargo.toml b/Cargo.toml
index 6375bce26..cfe18f019 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -68,6 +68,7 @@ url = { version = "2.1", features = ["serde"] }
 
 reqwest = { version = "0.11", features = ["blocking", "json", "rustls-tls"], default-features=false }
 chrono = "0.4.23"
+cidr-utils = "0.5.9"
 
 [target.'cfg(not(any(target_os = "android", target_os = "linux")))'.dependencies]
 cpal = "0.13.5"
diff --git a/flutter/lib/common/widgets/dialog.dart b/flutter/lib/common/widgets/dialog.dart
index 35a303c0b..8fab02a77 100644
--- a/flutter/lib/common/widgets/dialog.dart
+++ b/flutter/lib/common/widgets/dialog.dart
@@ -133,7 +133,7 @@ void changeWhiteList({Function()? callback}) async {
                 final ips =
                     newWhiteListField.trim().split(RegExp(r"[\s,;\n]+"));
                 // test ip
-                final ipMatch = RegExp(r"^\d+\.\d+\.\d+\.\d+$");
+                final ipMatch = RegExp(r"^\d+\.\d+\.\d+\.\d+(\/\d+)?$");
                 for (final ip in ips) {
                   if (!ipMatch.hasMatch(ip)) {
                     msg = "${translate("Invalid IP")} $ip";
diff --git a/src/server/connection.rs b/src/server/connection.rs
index 11960be8a..50c91d057 100644
--- a/src/server/connection.rs
+++ b/src/server/connection.rs
@@ -7,6 +7,7 @@ use crate::video_service;
 #[cfg(any(target_os = "android", target_os = "ios"))]
 use crate::{common::DEVICE_NAME, flutter::connection_manager::start_channel};
 use crate::{ipc, VERSION};
+use cidr_utils::cidr::IpCidr;
 use hbb_common::{
     config::Config,
     fs,
@@ -631,7 +632,10 @@ impl Connection {
                 .is_none()
             && whitelist
                 .iter()
-                .filter(|x| x.parse() == Ok(addr.ip()))
+                .filter(|x| match IpCidr::from_str(x) {
+                    Ok(cidr) => cidr.contains(addr.ip()),
+                    Err(_) => false,
+                })
                 .next()
                 .is_none()
         {
diff --git a/src/ui/index.tis b/src/ui/index.tis
index 8e2238b2d..6b1d1b7c7 100644
--- a/src/ui/index.tis
+++ b/src/ui/index.tis
@@ -395,7 +395,7 @@ class MyIdMenu: Reactor.Component {
                 if (value) {
                     var values = value.split(/[\s,;\n]+/g);
                     for (var ip in values) {
-                        if (!ip.match(/^\d+\.\d+\.\d+\.\d+$/)) {
+                        if (!ip.match(/^\d+\.\d+\.\d+\.\d+(\/\d+)?$/)) {
                             return translate("Invalid IP") + ": " + ip;
                         }
                     }