diff --git a/lib/rails_ext/actiontext_opengraph_embeds.rb b/lib/rails_ext/actiontext_opengraph_embeds.rb
index 712844d..d0748cd 100644
--- a/lib/rails_ext/actiontext_opengraph_embeds.rb
+++ b/lib/rails_ext/actiontext_opengraph_embeds.rb
@@ -48,11 +48,17 @@ class ActionText::Attachment::OpengraphEmbed
       end
 
       # A preview names a page on the public internet, so its host is a domain
-      # name: it has a dot and a letter in it, and no escapes. A bare address is
-      # not one, and a browser rewrites the many spellings of an address into a
+      # name, written plainly. A bare address is not one, and a browser rewrites
+      # the many spellings of an address ("2130706433", "0x7f.0.0.1") into a
       # single one before it fetches, which is a race a comparison here loses.
       def named_host?(host)
-        host.present? && host.exclude?("%") && host.include?(".") && host.match?(/[a-z]/i)
+        host.present? && host.exclude?("%") && host.include?(".") && domain_ending?(host.split(".").last)
+      end
+
+      # What keeps a name from reading as an address is its last label, which is
+      # a word: never a number, and never the hexadecimal spelling of one.
+      def domain_ending?(label)
+        label.match?(/[a-z]/i) && !label.match?(/\A0x/i)
       end
 
       def canonical_host(host)
diff --git a/test/lib/rails_ext/actiontext_opengraph_embeds_test.rb b/test/lib/rails_ext/actiontext_opengraph_embeds_test.rb
index a93360b..6949f79 100644
--- a/test/lib/rails_ext/actiontext_opengraph_embeds_test.rb
+++ b/test/lib/rails_ext/actiontext_opengraph_embeds_test.rb
@@ -38,7 +38,8 @@ class ActionText::Attachment::OpengraphEmbedTest < ActiveSupport::TestCase
 
   test "drops a link and an image on a bare address rather than a domain name" do
     [ "http://127.0.0.1/rooms/1", "http://2130706433/rooms/1", "http://0177.0.0.1/rooms/1",
-      "http://[::1]/rooms/1", "http://localhost/rooms/1", "https://203.0.113.10/image.png" ].each do |value|
+      "http://0x7f.0.0.1/rooms/1", "http://1.2.3.0xff/rooms/1", "http://[::1]/rooms/1",
+      "http://localhost/rooms/1", "https://203.0.113.10/image.png" ].each do |value|
       embed = embed_from href: value, url: value
 
       assert_nil embed.href, "expected #{value.inspect} to be dropped as a link"
@@ -46,6 +47,13 @@ class ActionText::Attachment::OpengraphEmbedTest < ActiveSupport::TestCase
     end
   end
 
+  test "keeps an internationalized domain written in punycode" do
+    embed = embed_from href: "https://xn--80aswg.xn--p1ai/page", url: "https://xn--80aswg.xn--p1ai/image.png"
+
+    assert_equal "https://xn--80aswg.xn--p1ai/page", embed.href
+    assert_equal "https://xn--80aswg.xn--p1ai/image.png", embed.url
+  end
+
   test "renders the image and the link when both are web URLs" do
     html = render_embed href: "https://example.com/page", url: "https://example.com/image.png"