diff --git a/browser/permissions/localhost_access_permission_browsertest.cc b/browser/permissions/localhost_access_permission_browsertest.cc
index 0ede59f9b98..adf13bc87f7 100644
--- a/browser/permissions/localhost_access_permission_browsertest.cc
+++ b/browser/permissions/localhost_access_permission_browsertest.cc
@@ -52,7 +52,9 @@ constexpr char kSimplePage[] = "/simple.html";
 
 }  // namespace
 
-class LocalhostAccessBrowserTest : public InProcessBrowserTest {
+class LocalhostAccessBrowserTest
+    : public InProcessBrowserTest,
+      public testing::WithParamInterface<network::mojom::IPAddressSpace> {
  public:
   LocalhostAccessBrowserTest() {
     feature_list_.InitWithFeaturesAndParameters(
@@ -113,10 +115,8 @@ class LocalhostAccessBrowserTest : public InProcessBrowserTest {
     mock_cert_verifier_.SetUpCommandLine(command_line);
     network::AddIpAddressSpaceOverridesToCommandLine(
         {network::GenerateIpAddressSpaceOverride(*https_server_),
-         // This will cause LOCAL_NETWORK prompt instead of the LOOPBACK_NETWORK
-         // prompt for localhost.
-         network::GenerateIpAddressSpaceOverride(
-             *localhost_server_, network::mojom::IPAddressSpace::kLocal)},
+         network::GenerateIpAddressSpaceOverride(*localhost_server_,
+                                                 GetParam())},
         *command_line);
   }
 
@@ -182,16 +182,27 @@ class LocalhostAccessBrowserTest : public InProcessBrowserTest {
     ASSERT_EQ(expected, EvalJs(contents(), insert_image));
   }
 
+  ContentSettingsType GetContentSettingsType() {
+    return GetParam() == network::mojom::IPAddressSpace::kLocal
+               ? ContentSettingsType::LOCAL_NETWORK
+               : ContentSettingsType::LOOPBACK_NETWORK;
+  }
+
+  permissions::RequestType GetRequestType() {
+    return GetParam() == network::mojom::IPAddressSpace::kLocal
+               ? permissions::RequestType::kLocalNetwork
+               : permissions::RequestType::kLoopbackNetwork;
+  }
+
   void CheckCurrentStatusIs(ContentSetting content_setting) {
-    EXPECT_EQ(
-        content_settings()->GetContentSetting(
-            embedding_url_, embedding_url_, ContentSettingsType::LOCAL_NETWORK),
-        content_setting);
+    EXPECT_EQ(content_settings()->GetContentSetting(
+                  embedding_url_, embedding_url_, GetContentSettingsType()),
+              content_setting);
   }
 
   void SetCurrentStatus(ContentSetting content_setting) {
     content_settings()->SetContentSettingDefaultScope(
-        embedding_url_, embedding_url_, ContentSettingsType::LOCAL_NETWORK,
+        embedding_url_, embedding_url_, GetContentSettingsType(),
         content_setting);
   }
 
@@ -210,8 +221,7 @@ class LocalhostAccessBrowserTest : public InProcessBrowserTest {
     InsertImage(localhost_url.spec(), true);
     // Make sure prompt came up.
     EXPECT_EQ(1, prompt_factory()->show_count());
-    EXPECT_TRUE(prompt_factory()->RequestTypeSeen(
-        permissions::RequestType::kLocalNetwork));
+    EXPECT_TRUE(prompt_factory()->RequestTypeSeen(GetRequestType()));
     // Check that the relevant content settings are now ALLOWed.
     CheckCurrentStatusIs(ContentSetting::CONTENT_SETTING_ALLOW);
     // Access to localhost resources should be allowed.
@@ -236,8 +246,7 @@ class LocalhostAccessBrowserTest : public InProcessBrowserTest {
     InsertImage(localhost_url.spec(), false);
     // Make sure prompt came up.
     EXPECT_EQ(1, prompt_factory()->show_count());
-    EXPECT_TRUE(prompt_factory()->RequestTypeSeen(
-        permissions::RequestType::kLocalNetwork));
+    EXPECT_TRUE(prompt_factory()->RequestTypeSeen(GetRequestType()));
     // Check that the relevant content settings are now DENY.
     CheckCurrentStatusIs(ContentSetting::CONTENT_SETTING_BLOCK);
     // Access to localhost resources should be denied.
@@ -263,8 +272,7 @@ class LocalhostAccessBrowserTest : public InProcessBrowserTest {
     // Make sure prompts came up (when dismissed there are 2 prompts of the same
     // type).
     EXPECT_EQ(2, prompt_factory()->show_count());
-    EXPECT_TRUE(prompt_factory()->RequestTypeSeen(
-        permissions::RequestType::kLocalNetwork));
+    EXPECT_TRUE(prompt_factory()->RequestTypeSeen(GetRequestType()));
     // Check that the relevant content settings are still ASK.
     CheckCurrentStatusIs(ContentSetting::CONTENT_SETTING_ASK);
     // Access to localhost resources should be prompted again.
@@ -307,7 +315,7 @@ class LocalhostAccessBrowserTest : public InProcessBrowserTest {
   std::unique_ptr<permissions::MockPermissionPromptFactory> prompt_factory_;
 };
 
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, Localhost) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, Localhost) {
   std::string test_domain = "localhost";
   embedding_url_ = https_server_->GetURL(kTestEmbeddingDomain, kSimplePage);
   const auto& target_url =
@@ -321,7 +329,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, Localhost) {
   CheckAskAndDismissFlow(target_url);
 }
 
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, DotLocalhost) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, DotLocalhost) {
   std::string test_domain = "test.localhost";
   embedding_url_ = https_server_->GetURL(kTestEmbeddingDomain, kSimplePage);
   const auto& target_url =
@@ -335,7 +343,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, DotLocalhost) {
   CheckAskAndDismissFlow(target_url);
 }
 
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, OneTwoSeven) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, OneTwoSeven) {
   std::string test_domain = "127.0.0.1";
   embedding_url_ = https_server_->GetURL(kTestEmbeddingDomain, kSimplePage);
   const auto& target_url =
@@ -349,7 +357,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, OneTwoSeven) {
   CheckAskAndDismissFlow(target_url);
 }
 
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, IncognitoModeInheritAllow) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, IncognitoModeInheritAllow) {
   // Allowed permission for a website is ASK in incognito.
   std::string test_domain = "localhost";
   embedding_url_ = https_server_->GetURL(kTestEmbeddingDomain, kSimplePage);
@@ -363,7 +371,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, IncognitoModeInheritAllow) {
   CheckCurrentStatusIs(ContentSetting::CONTENT_SETTING_ASK);
 }
 
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, IncognitoModeInheritBlock) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, IncognitoModeInheritBlock) {
   // Blocked permission for a website is ASK in incognito.
   std::string test_domain = "localhost";
   embedding_url_ = https_server_->GetURL(kTestEmbeddingDomain, kSimplePage);
@@ -377,7 +385,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, IncognitoModeInheritBlock) {
   CheckCurrentStatusIs(ContentSetting::CONTENT_SETTING_ASK);
 }
 
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, IncognitoModeDoesNotLeak) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, IncognitoModeDoesNotLeak) {
   // Permission set in Incognito does not leak back to normal mode.
   Browser* original_browser = browser();
   Browser* incognito_browser = CreateIncognitoBrowser();
@@ -394,7 +402,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, IncognitoModeDoesNotLeak) {
   CheckCurrentStatusIs(ContentSetting::CONTENT_SETTING_ASK);
 }
 
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, NoPermissionPrompt) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, NoPermissionPrompt) {
   // No permission prompt is shown when we request non-localhost domain.
   std::string test_domain = "b.com";
   embedding_url_ = https_server_->GetURL(kTestEmbeddingDomain, kSimplePage);
@@ -403,7 +411,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, NoPermissionPrompt) {
 }
 
 // Test that WebSocket connections to localhost are blocked/allowed.
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, WebSocket) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, WebSocket) {
   // Start a WebSocket server.
   auto ws_url = net::test_server::GetWebSocketURL(
       *localhost_server_, "localhost", "/echo-with-no-extension");
@@ -439,7 +447,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, WebSocket) {
 // Test that service worker connections are blocked/allowed correctly.
 // Service workers making requests to localhost subresources should be allowed
 // if the page has the ALLOW content setting, and blocked otherwise.
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, ServiceWorker) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, ServiceWorker) {
   std::string test_domain = "localhost";
   embedding_url_ =
       https_server_->GetURL(kTestEmbeddingDomain, "/navigator/simple.html");
@@ -468,7 +476,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, ServiceWorker) {
 
 // Test that localhost connections blocked by adblock are still blocked
 // without permission prompt.
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, AdblockRule) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, AdblockRule) {
   // Add adblock rule to block localhost.
   std::string test_domain = "localhost";
   embedding_url_ = https_server_->GetURL(kTestEmbeddingDomain, kSimplePage);
@@ -481,7 +489,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, AdblockRule) {
 }
 
 // Test that badfiltering a localhost adblock rule makes permission come up.
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, AdblockRuleBadfilter) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, AdblockRuleBadfilter) {
   std::string test_domain = "localhost";
   embedding_url_ = https_server_->GetURL(kTestEmbeddingDomain, kSimplePage);
   const auto& target_url =
@@ -495,7 +503,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, AdblockRuleBadfilter) {
 }
 
 // Test that different hosts under the same eTLD+1 can prompt.
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, WebsitePartOfETLDP1) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, WebsitePartOfETLDP1) {
   std::string test_domain = "localhost";
   embedding_url_ = https_server_->GetURL(
       base::StrCat({"test1.", kTestEmbeddingDomain}), kSimplePage);
@@ -509,7 +517,7 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, WebsitePartOfETLDP1) {
 
 // Test that localhost connections blocked by adblock are still blocked
 // without permission prompt, and exceptioned domains cause permission prompt.
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, AdblockRuleException) {
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTest, AdblockRuleException) {
   // Add adblock rule to block localhost.
   std::string test_domain = "localhost";
   embedding_url_ = https_server_->GetURL(kTestEmbeddingDomain, kSimplePage);
@@ -522,6 +530,12 @@ IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTest, AdblockRuleException) {
   CheckAskAndAcceptFlow(target_url);
 }
 
+INSTANTIATE_TEST_SUITE_P(
+    ,
+    LocalhostAccessBrowserTest,
+    testing::Values(network::mojom::IPAddressSpace::kLocal,
+                    network::mojom::IPAddressSpace::kLoopback));
+
 class LocalhostAccessBrowserTestFeatureDisabled
     : public LocalhostAccessBrowserTest {
  public:
@@ -533,10 +547,16 @@ class LocalhostAccessBrowserTestFeatureDisabled
   }
 };
 
-IN_PROC_BROWSER_TEST_F(LocalhostAccessBrowserTestFeatureDisabled,
+IN_PROC_BROWSER_TEST_P(LocalhostAccessBrowserTestFeatureDisabled,
                        NoPermissionPrompt) {
   std::string test_domain = "localhost";
   embedding_url_ = https_server_->GetURL(kTestEmbeddingDomain, kSimplePage);
   const auto& target_url = https_server_->GetURL(test_domain, kTestTargetPath);
   CheckNoPromptFlow(true, target_url);
 }
+
+INSTANTIATE_TEST_SUITE_P(
+    ,
+    LocalhostAccessBrowserTestFeatureDisabled,
+    testing::Values(network::mojom::IPAddressSpace::kLocal,
+                    network::mojom::IPAddressSpace::kLoopback));