diff --git a/lib/net/http/responses.rb b/lib/net/http/responses.rb
index bc7642c..a17c859 100644
--- a/lib/net/http/responses.rb
+++ b/lib/net/http/responses.rb
@@ -267,5 +267,68 @@ class Net::HTTPResponse
   }
 end
 
-# :startdoc:
+class Net::HTTPResponse
+  def continue?; code == "100".freeze end
+  def switch_protocol?; code == "101".freeze end
+
+  def ok?; code == "200".freeze end
+  def created?; code == "201".freeze end
+  def accepted?; code == "202".freeze end
+  def non_authoritative_information?; code == "203".freeze end
+  def no_content?; code == "204".freeze end
+  def reset_content?; code == "205".freeze end
+  def partial_content?; code == "206".freeze end
+  def multi_status?; code == "207".freeze end
+  def im_used?; code == "226".freeze end
+
+  def multiple_choices?; code == "300".freeze end
+  def moved_permanently?; code == "301".freeze end
+  def found?; code == "302".freeze end
+  def see_other?; code == "303".freeze end
+  def not_modified?; code == "304".freeze end
+  def use_proxy?; code == "305".freeze end
+  def temporary_redirect?; code == "307".freeze end
+
+  def bad_request?; code == "400".freeze end
+  def unauthorized?; code == "401".freeze end
+  def payment_required?; code == "402".freeze end
+  def forbidden?; code == "403".freeze end
+  def not_found?; code == "404".freeze end
+  def method_not_allowed?; code == "405".freeze end
+  def not_acceptable?; code == "406".freeze end
+  def proxy_authentication_required?; code == "407".freeze end
+  def request_timeout?; code == "408".freeze end
+  def conflict?; code == "409".freeze end
+  def gone?; code == "410".freeze end
+  def length_required?; code == "411".freeze end
+  def precondition_failed?; code == "412".freeze end
+  def request_entity_too_large?; code == "413".freeze end
+  def request_uri_too_long?; code == "414".freeze end
+  def unsupported_media_type?; code == "415".freeze end
+  def requested_range_not_satisfiable?; code == "416".freeze end
+  def expectation_failed?; code == "417".freeze end
+  def unprocessable_entity?; code == "422".freeze end
+  def locked?; code == "423".freeze end
+  def failed_dependency?; code == "424".freeze end
+  def upgrade_required?; code == "426".freeze end
+  def precondition_required?; code == "428".freeze end
+  def too_many_requests?; code == "429".freeze end
+  def request_header_fields_too_large?; code == "431".freeze end
 
+  def internal_server_error?; code == "500".freeze end
+  def not_implemented?; code == "501".freeze end
+  def bad_gateway?; code == "502".freeze end
+  def service_unavailable?; code == "503".freeze end
+  def gateway_timeout?; code == "504".freeze end
+  def version_not_supported?; code == "505".freeze end
+  def insufficient_storage?; code == "507".freeze end
+  def network_authentication_required?; code == "511".freeze end
+
+  def informational?; code.to_i.between?(100, 199) end
+  def successful?; code.to_i.between?(200, 299) end
+  def redirection?; code.to_i.between?(300, 399) end
+  def client_error?; code.to_i.between?(400, 499) end
+  def server_error?; code.to_i.between?(500, 599) end
+end
+
+# :startdoc:
diff --git a/test/net/http/test_httpresponses.rb b/test/net/http/test_httpresponses.rb
index bf7fbee..8ee0008 100644
--- a/test/net/http/test_httpresponses.rb
+++ b/test/net/http/test_httpresponses.rb
@@ -21,4 +21,24 @@ class HTTPResponsesTest < Test::Unit::TestCase
       assert(klass < group, "#{klass.name} (#{code}) must inherit from #{group.name}")
     }
   end
+
+  def test_status_code_methods
+    response = Net::HTTPResponse.new('1.1', '200', 'OK')
+
+    assert response.ok?
+    assert response.successful?
+    assert !response.informational?
+    assert !response.redirection?
+    assert !response.client_error?
+    assert !response.server_error?
+
+    response = Net::HTTPResponse.new('1.1', '400', 'Bad Request')
+
+    assert response.bad_request?
+    assert response.client_error?
+    assert !response.informational?
+    assert !response.successful?
+    assert !response.redirection?
+    assert !response.server_error?
+  end
 end