diff --git a/app/models/pages_domain.rb b/app/models/pages_domain.rb
index f2f2fc1e32a3655320c3efa7dda035d6aaea2c2c..9873ad992cd7ae20ed6a108c8a3f6af58f962926 100644
--- a/app/models/pages_domain.rb
+++ b/app/models/pages_domain.rb
@@ -1,7 +1,7 @@
 class PagesDomain < ActiveRecord::Base
   belongs_to :project
 
-  validates :domain, hostname: true
+  validates :domain, hostname: { allow_numeric_hostname: true, require_valid_tld: true }
   validates :domain, uniqueness: { case_sensitive: false }
   validates :certificate, certificate: true, allow_nil: true, allow_blank: true
   validates :key, certificate_key: true, allow_nil: true, allow_blank: true
diff --git a/changelogs/unreleased/allow_numeric_pages_domain.yml b/changelogs/unreleased/allow_numeric_pages_domain.yml
new file mode 100644
index 0000000000000000000000000000000000000000..10d9f26f88d81e20f5b3f2a6849794768e9deeed
--- /dev/null
+++ b/changelogs/unreleased/allow_numeric_pages_domain.yml
@@ -0,0 +1,4 @@
+---
+title: Allow numeric pages domain
+merge_request: 11550
+author:
diff --git a/spec/models/pages_domain_spec.rb b/spec/models/pages_domain_spec.rb
index c6c45d789902431c2938ed357ca1f7a823021e1e..dc646fc69181a0c1a132ce1a72055fd0da35a564 100644
--- a/spec/models/pages_domain_spec.rb
+++ b/spec/models/pages_domain_spec.rb
@@ -20,6 +20,12 @@
       it { is_expected.to be_valid }
     end
 
+    context 'valid numeric domain' do
+      let(:domain) { '123.domain.com' }
+
+      it { is_expected.to be_valid }
+    end
+
     context 'valid hexadecimal-looking domain' do
       let(:domain) { '0x12345.com'}