diff --git a/runtime/tests/concurrency/stress_test_list.json b/runtime/tests/concurrency/stress_test_list.json
index c40bb0d7421..f0310dca16e 100644
--- a/runtime/tests/concurrency/stress_test_list.json
+++ b/runtime/tests/concurrency/stress_test_list.json
@@ -3315,7 +3315,6 @@
     "../../../tests/standalone/io/many_file_operations_test.dart",
     "../../../tests/standalone/io/named_pipe_script_test.dart",
     "../../../tests/standalone/io/network_interface_test.dart",
-    "../../../tests/standalone/io/network_policy_test.dart",
     "../../../tests/standalone/io/parent_test.dart",
     "../../../tests/standalone/io/platform_os_version_test.dart",
     "../../../tests/standalone/io/process_exit_test.dart",
@@ -6637,7 +6636,6 @@
     "../../../tests/standalone_2/io/many_directory_operations_test.dart",
     "../../../tests/standalone_2/io/many_file_operations_test.dart",
     "../../../tests/standalone_2/io/network_interface_test.dart",
-    "../../../tests/standalone_2/io/network_policy_test.dart",
     "../../../tests/standalone_2/io/parent_test.dart",
     "../../../tests/standalone_2/io/platform_os_version_test.dart",
     "../../../tests/standalone_2/io/process_exit_test.dart",
diff --git a/sdk/lib/io/embedder_config.dart b/sdk/lib/io/embedder_config.dart
index 9b934a6c9d9..bcb4a01d519 100644
--- a/sdk/lib/io/embedder_config.dart
+++ b/sdk/lib/io/embedder_config.dart
@@ -36,24 +36,6 @@ abstract class _EmbedderConfig {
   @pragma('vm:entry-point')
   static bool _maySleep = true;
 
-  /// Whether the isolate may establish insecure socket connections
-  /// to all domains.
-  ///
-  /// This setting can be overridden by per-domain policies.
-  @Deprecated(
-      "To be re-implemented in https://github.com/flutter/flutter/issues/54448")
-  @pragma('vm:entry-point')
-  static bool _mayInsecurelyConnectToAllDomains = true;
-
-  /// Domain network policies set by embedder.
-  @Deprecated(
-      "To be re-implemented in https://github.com/flutter/flutter/issues/54448")
-  @pragma('vm:entry-point')
-  static void _setDomainPolicies(String domainNetworkPolicyJson) {
-    // Doesn't do anything because the implementation has been reverted in
-    // https://github.com/flutter/flutter/issues/72723.
-  }
-
   // TODO(zra): Consider adding:
   // - an option to disallow modifying SecurityContext.defaultContext
   // - an option to disallow closing stdout and stderr.
diff --git a/sdk/lib/io/io.dart b/sdk/lib/io/io.dart
index dbecc26cb17..014acd450ea 100644
--- a/sdk/lib/io/io.dart
+++ b/sdk/lib/io/io.dart
@@ -220,7 +220,6 @@ part 'io_sink.dart';
 part 'io_service.dart';
 part 'link.dart';
 part 'namespace_impl.dart';
-part 'network_policy.dart';
 part 'network_profiling.dart';
 part 'overrides.dart';
 part 'platform.dart';
diff --git a/sdk/lib/io/io_sources.gni b/sdk/lib/io/io_sources.gni
index fb148df2b17..7410a13530e 100644
--- a/sdk/lib/io/io_sources.gni
+++ b/sdk/lib/io/io_sources.gni
@@ -20,7 +20,6 @@ io_sdk_sources = [
   "io_sink.dart",
   "link.dart",
   "namespace_impl.dart",
-  "network_policy.dart",
   "network_profiling.dart",
   "overrides.dart",
   "platform.dart",
diff --git a/sdk/lib/io/network_policy.dart b/sdk/lib/io/network_policy.dart
deleted file mode 100644
index ef00ffc6771..00000000000
--- a/sdk/lib/io/network_policy.dart
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of dart.io;
-
-/// Whether insecure connections to [host] are allowed.
-///
-/// This API is deprecated and always returns true. See
-/// https://github.com/flutter/flutter/issues/72723 for more details.
-///
-/// [host] must be a [String] or [InternetAddress].
-///
-/// If any of the domain policies match [host], the matching policy will make
-/// the decision. If multiple policies apply, the top matching policy makes the
-/// decision. If none of the domain policies match, the embedder default is
-/// used.
-///
-/// Loopback addresses are always allowed.
-@Deprecated("See https://github.com/flutter/flutter/issues/54448 for followup")
-bool isInsecureConnectionAllowed(dynamic host) {
-  return true;
-}
diff --git a/tests/standalone/io/network_policy_test.dart b/tests/standalone/io/network_policy_test.dart
deleted file mode 100644
index 2f9878da10f..00000000000
--- a/tests/standalone/io/network_policy_test.dart
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:io';
-
-import "package:expect/expect.dart";
-
-void _checkAllows(List<String> domains) {
-  for (final domain in domains) {
-    Expect.isTrue(
-        isInsecureConnectionAllowed(domain), "$domain should be allowed.");
-  }
-}
-
-void main() {
-  // All domains and addresses are allowed.
-  _checkAllows([
-    "mailfoobar.com",
-    "abc.com",
-    "oobar.com",
-    "foobar.co",
-    "128.221.55.31",
-    "fe80::4607:0bff:fea0:7747%invalid",
-    "baz.foobar.com",
-    "foobar.com",
-    "test.baz.foobar.com",
-    "test2.test.baz.foobar.com",
-    "::1",
-    "localhost",
-  ]);
-}
diff --git a/tests/standalone_2/io/network_policy_test.dart b/tests/standalone_2/io/network_policy_test.dart
deleted file mode 100644
index 108f1d43d53..00000000000
--- a/tests/standalone_2/io/network_policy_test.dart
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// @dart = 2.9
-
-import 'dart:io';
-
-import "package:expect/expect.dart";
-
-void _checkAllows(List<String> domains) {
-  for (final domain in domains) {
-    Expect.isTrue(
-        isInsecureConnectionAllowed(domain), "$domain should be allowed.");
-  }
-}
-
-void main() {
-  // All domains and addresses are allowed.
-  _checkAllows([
-    "mailfoobar.com",
-    "abc.com",
-    "oobar.com",
-    "foobar.co",
-    "128.221.55.31",
-    "fe80::4607:0bff:fea0:7747%invalid",
-    "baz.foobar.com",
-    "foobar.com",
-    "test.baz.foobar.com",
-    "test2.test.baz.foobar.com",
-    "::1",
-    "localhost",
-  ]);
-}