diff --git a/test/controllers/api/flat_json_params_test.rb b/test/controllers/api/flat_json_params_test.rb
index 77a74f454e..172e11f727 100644
--- a/test/controllers/api/flat_json_params_test.rb
+++ b/test/controllers/api/flat_json_params_test.rb
@@ -53,7 +53,7 @@ class FlatJsonParamsTest < ActionDispatch::IntegrationTest
   end
 
   test "create push subscription with flat JSON" do
-    stub_dns_resolution("142.250.185.206")
+    stub_web_push_dns_resolution
 
     post user_push_subscriptions_path(users(:kevin)),
       params: { endpoint: "https://fcm.googleapis.com/fcm/send/abc123", p256dh_key: "key1", auth_key: "key2" },
diff --git a/test/controllers/users/push_subscriptions_controller_test.rb b/test/controllers/users/push_subscriptions_controller_test.rb
index 284d82b77b..b18f4a7f8c 100644
--- a/test/controllers/users/push_subscriptions_controller_test.rb
+++ b/test/controllers/users/push_subscriptions_controller_test.rb
@@ -1,11 +1,9 @@
 require "test_helper"
 
 class Users::PushSubscriptionsControllerTest < ActionDispatch::IntegrationTest
-  PUBLIC_TEST_IP = "142.250.185.206"
-
   setup do
     sign_in_as :david
-    stub_dns_resolution(PUBLIC_TEST_IP)
+    stub_web_push_dns_resolution
   end
 
   test "create new push subscription" do
diff --git a/test/integration/notifications_test.rb b/test/integration/notifications_test.rb
index f581fb5e94..c7acef0655 100644
--- a/test/integration/notifications_test.rb
+++ b/test/integration/notifications_test.rb
@@ -16,6 +16,8 @@ class NotificationDeliveryTest < ActiveSupport::TestCase
     Notification.register_push_target(:web)
     Notification.register_push_target(push_target_with_tracking)
 
+    stub_web_push_dns_resolution
+
     # Give assignee a web push subscription
     @assignee.push_subscriptions.create!(
       endpoint: "https://fcm.googleapis.com/fcm/send/test123",
diff --git a/test/lib/web_push/persistent_request_test.rb b/test/lib/web_push/persistent_request_test.rb
index 649e27b759..41d5572492 100644
--- a/test/lib/web_push/persistent_request_test.rb
+++ b/test/lib/web_push/persistent_request_test.rb
@@ -1,12 +1,11 @@
 require "test_helper"
 
 class WebPush::PersistentRequestTest < ActiveSupport::TestCase
-  PUBLIC_TEST_IP = "142.250.185.206"
   ENDPOINT = "https://fcm.googleapis.com/fcm/send/test123"
 
   test "pins connection to endpoint_ip" do
     request = stub_request(:post, ENDPOINT)
-      .with(ipaddr: PUBLIC_TEST_IP)
+      .with(ipaddr: DnsTestHelper::WEB_PUSH_PUBLIC_TEST_IP)
       .to_return(status: 201)
 
     notification = WebPush::Notification.new(
@@ -15,7 +14,7 @@ class WebPush::PersistentRequestTest < ActiveSupport::TestCase
       url: "/test",
       badge: 0,
       endpoint: ENDPOINT,
-      endpoint_ip: PUBLIC_TEST_IP,
+      endpoint_ip: DnsTestHelper::WEB_PUSH_PUBLIC_TEST_IP,
       p256dh_key: "BNcRdreALRFXTkOOUHK1EtK2wtaz5Ry4YfYCA_0QTpQtUbVlUls0VJXg7A8u-Ts1XbjhazAkj7I99e8QcYP7DkM",
       auth_key: "tBHItJI5svbpez7KI4CCXg"
     )
diff --git a/test/models/notification/push_target/web_test.rb b/test/models/notification/push_target/web_test.rb
index dc09e77bf1..dae683eb95 100644
--- a/test/models/notification/push_target/web_test.rb
+++ b/test/models/notification/push_target/web_test.rb
@@ -5,7 +5,7 @@ class Notification::PushTarget::WebTest < ActiveSupport::TestCase
     @user = users(:david)
     @notification = notifications(:logo_mentioned_david)
 
-    stub_dns_resolution("142.250.185.206")
+    stub_web_push_dns_resolution
 
     @user.push_subscriptions.create!(
       endpoint: "https://fcm.googleapis.com/fcm/send/test123",
diff --git a/test/models/push/subscription_test.rb b/test/models/push/subscription_test.rb
index 65393c0e90..b654e44988 100644
--- a/test/models/push/subscription_test.rb
+++ b/test/models/push/subscription_test.rb
@@ -1,10 +1,8 @@
 require "test_helper"
 
 class Push::SubscriptionTest < ActiveSupport::TestCase
-  PUBLIC_TEST_IP = "142.250.185.206" # google.com IP
-
   setup do
-    stub_dns_resolution(PUBLIC_TEST_IP)
+    stub_web_push_dns_resolution
   end
 
   test "valid subscription with permitted endpoint" do
@@ -92,7 +90,7 @@ class Push::SubscriptionTest < ActiveSupport::TestCase
       auth_key: "test_auth"
     )
 
-    assert_equal PUBLIC_TEST_IP, subscription.resolved_endpoint_ip
+    assert_equal DnsTestHelper::WEB_PUSH_PUBLIC_TEST_IP, subscription.resolved_endpoint_ip
   end
 
   test "accepts all permitted push service domains" do
diff --git a/test/test_helpers/dns_test_helper.rb b/test/test_helpers/dns_test_helper.rb
index 8119ca01e7..34f4c54389 100644
--- a/test/test_helpers/dns_test_helper.rb
+++ b/test/test_helpers/dns_test_helper.rb
@@ -1,4 +1,6 @@
 module DnsTestHelper
+  WEB_PUSH_PUBLIC_TEST_IP = "142.250.185.206" # stable public IP for web push DNS stubs in tests
+
   private
 
   def stub_dns_resolution(*ips)
@@ -6,4 +8,8 @@ def stub_dns_resolution(*ips)
     dns_mock.stubs(:each_address).multiple_yields(*ips)
     Resolv::DNS.stubs(:open).yields(dns_mock)
   end
+
+  def stub_web_push_dns_resolution
+    stub_dns_resolution(WEB_PUSH_PUBLIC_TEST_IP)
+  end
 end