diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index 6ee333af7cd..363b3bb45c7 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -806,6 +806,10 @@ function gKeywordURIFixup(fixupInfo, topic, data) {
     asciiHost = asciiHost.slice(0, -1);
   }
 
+  // Ignore number-only things entirely (no decimal IPs for you!)
+  if (/^\d+$/.test(asciiHost))
+    return;
+
   let onLookupComplete = (request, record, status) => {
     let browser = weakBrowser.get();
     if (!Components.isSuccessCode(status) || !browser)
diff --git a/browser/base/content/test/general/browser_urlbarSearchSingleWordNotification.js b/browser/base/content/test/general/browser_urlbarSearchSingleWordNotification.js
index 2e636c52cdd..73414274085 100644
--- a/browser/base/content/test/general/browser_urlbarSearchSingleWordNotification.js
+++ b/browser/base/content/test/general/browser_urlbarSearchSingleWordNotification.js
@@ -62,6 +62,12 @@ add_task(function* test_navigate_full_domain() {
   gBrowser.removeTab(tab);
 });
 
+add_task(function* test_navigate_numbers() {
+  let tab = gBrowser.selectedTab = gBrowser.addTab();
+  yield* runURLBarSearchTest("1234", true, false);
+  gBrowser.removeTab(tab);
+});
+
 function get_test_function_for_localhost_with_hostname(hostName, isPrivate) {
   return function* test_navigate_single_host() {
     const pref = "browser.fixup.domainwhitelist.localhost";