diff --git a/lib/cms_scanner/target/scope.rb b/lib/cms_scanner/target/scope.rb
index 75214097..e46c760a 100644
--- a/lib/cms_scanner/target/scope.rb
+++ b/lib/cms_scanner/target/scope.rb
@@ -43,15 +43,25 @@ def in_scope_uris(res, xpath = '//@href|//@src|//@data-src')
     #
     # @return [ Regexp ] The pattern related to the target url and in scope domains,
     #                    it also matches escaped /, such as in JSON JS data: http:\/\/t.com\/
+    # rubocop:disable Metrics/AbcSize
     def scope_url_pattern
       return @scope_url_pattern if @scope_url_pattern
 
-      domains = [uri.host + uri.path] + scope.domains[1..-1]&.map(&:to_s) + scope.invalid_domains
+      domains = [uri.host + uri.path]
+
+      domains += if scope.domains.empty?
+                   [*scope.invalid_domains[1..-1]]
+                 else
+                   [*scope.domains[1..-1]].map(&:to_s) + scope.invalid_domains
+                 end
 
       domains.map! { |d| Regexp.escape(d.gsub(%r{/$}, '')).gsub('\*', '.*').gsub('/', '\\\\\?/') }
 
+      domains[0].gsub!(Regexp.escape(uri.host), Regexp.escape(uri.host) + '(?::\\d+)?') if uri.port
+
       @scope_url_pattern = %r{https?:\\?/\\?/(?:#{domains.join('|')})\\?/?}i
     end
+    # rubocop:enable Metrics/AbcSize
 
     # Scope Implementation
     class Scope
diff --git a/lib/cms_scanner/version.rb b/lib/cms_scanner/version.rb
index ca1d6a5d..3bb5b596 100644
--- a/lib/cms_scanner/version.rb
+++ b/lib/cms_scanner/version.rb
@@ -2,5 +2,5 @@
 
 # Version
 module CMSScanner
-  VERSION = '0.5.0'
+  VERSION = '0.5.1'
 end
diff --git a/spec/lib/target/scope_spec.rb b/spec/lib/target/scope_spec.rb
index 8bf98672..a256f300 100644
--- a/spec/lib/target/scope_spec.rb
+++ b/spec/lib/target/scope_spec.rb
@@ -112,17 +112,32 @@
   describe '#scope_url_pattern' do
     context 'when no scope given' do
       its(:scope_url_pattern) { should eql %r{https?:\\?/\\?/(?:e\.org)\\?/?}i }
+
+      context 'when target is an invalid domain for PublicSuffix' do
+        let(:url) { 'http://wp-lab/' }
+
+        its(:scope_url_pattern) { should eql %r{https?:\\?/\\?/(?:wp\-lab)\\?/?}i }
+      end
+
+      context 'when a port is present in the target URL' do
+        let(:url) { 'http://wp.lab:82/aa' }
+
+        its(:scope_url_pattern) { should eql %r{https?:\\?/\\?/(?:wp\.lab(?::\d+)?\\?/aa)\\?/?}i }
+        its(:scope_url_pattern) { should match 'https://wp.lab:82/aa' }
+      end
     end
 
     context 'when scope given' do
-      let(:opts) { super().merge(scope: ['*.cdn.org', 'wp-lamp']) }
+      let(:opts) { super().merge(scope: ['*.cdn.org', 'wp-lamp', '192.168.1.1']) }
 
-      its(:scope_url_pattern) { should eql %r{https?:\\?/\\?/(?:e\.org|.*\.cdn\.org|wp\-lamp)\\?/?}i }
+      its(:scope_url_pattern) { should eql %r{https?:\\?/\\?/(?:e\.org|.*\.cdn\.org|192\.168\.1\.1|wp\-lamp)\\?/?}i }
 
       context 'when target URL has a subdir' do
         let(:url) { 'https://e.org/blog/test' }
 
-        its(:scope_url_pattern) { should eql %r{https?:\\?/\\?/(?:e\.org\\?/blog\\?/test|.*\.cdn\.org|wp\-lamp)\\?/?}i }
+        its(:scope_url_pattern) do
+          should eql %r{https?:\\?/\\?/(?:e\.org\\?/blog\\?/test|.*\.cdn\.org|192\.168\.1\.1|wp\-lamp)\\?/?}i
+        end
       end
     end
   end