diff --git a/.gitignore b/.gitignore
index d87d4be..eba00d5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,4 @@ spec/reports
 test/tmp
 test/version_tmp
 tmp
+gemfiles/*.lock
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..29bba75
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,13 @@
+language: ruby
+rvm:
+  - 1.9.3
+  - 2.0.0
+  - ruby-head
+  - jruby-19mode
+  - jruby-head
+  - rbx-2.1.1
+script: rspec
+gemfile:
+  - gemfiles/non_BIC.gemfile
+  - gemfiles/BIC_rails_4.gemfile
+  - gemfiles/BIC_rails_3.gemfile
diff --git a/Appraisals b/Appraisals
new file mode 100644
index 0000000..bf15ae3
--- /dev/null
+++ b/Appraisals
@@ -0,0 +1,12 @@
+appraise 'non-BIC' do
+end
+
+appraise 'BIC rails 3' do
+  gem 'activemodel', '~>3.2.0'
+  gem 'banking_data', '~>0.5.0'
+end
+
+appraise 'BIC rails 4' do
+  gem 'activemodel', '~>4.0.0'
+  gem 'banking_data', '~>0.5.0'
+end
diff --git a/Gemfile b/Gemfile
index 76065bb..ad09323 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,6 @@
 source 'https://rubygems.org'
 
+gem 'iban-tools', github: 'opahk/iban-tools', branch: 'banking_data'
+
 # Specify your gem's dependencies in iban_validation.gemspec
 gemspec
diff --git a/README.md b/README.md
index 417e160..8fa77e4 100644
--- a/README.md
+++ b/README.md
@@ -18,10 +18,26 @@ Or install it yourself as:
 
 ## Usage
 
-In your rails model
+### Basic IBAN validator (format only)
+
+In your rails model:
 
     validates :iban_attribute, iban: true
 
+This validates the format of the IBAN based on the specification for each
+country.
+
+### Known IBAN validator
+
+In your rails model:
+
+    validates :iban_attribute, known_iban: true
+
+This version additionally validates whether the bank code part of the IBAN
+(Bankleitzahl, Bank Clearing Nummer) is known by comparing it to a list of
+known bank codes. This list is provided by the `banking_data` gem and currently
+only comprises DE, AT and CH.
+
 ## Contributing
 
 1. Fork it
diff --git a/Rakefile b/Rakefile
index 2995527..0fa5021 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1 +1,12 @@
 require "bundler/gem_tasks"
+require 'appraisal'
+
+gem 'rspec', '>= 1.2.4'
+require 'rspec/core/rake_task'
+
+task :default => :core
+
+RSpec::Core::RakeTask.new(:core) do |spec|
+  spec.pattern = 'spec/**/*_spec.rb'
+  spec.rspec_opts = ['--backtrace']
+end
diff --git a/gemfiles/BIC_rails_3.gemfile b/gemfiles/BIC_rails_3.gemfile
new file mode 100644
index 0000000..6fe29d2
--- /dev/null
+++ b/gemfiles/BIC_rails_3.gemfile
@@ -0,0 +1,9 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "iban-tools", :github=>"opahk/iban-tools", :branch=>"banking_data"
+gem "activemodel", "~>3.2.0"
+gem "banking_data", "~>0.5.0"
+
+gemspec :path=>"../"
\ No newline at end of file
diff --git a/gemfiles/BIC_rails_4.gemfile b/gemfiles/BIC_rails_4.gemfile
new file mode 100644
index 0000000..fb31c50
--- /dev/null
+++ b/gemfiles/BIC_rails_4.gemfile
@@ -0,0 +1,9 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "iban-tools", :github=>"opahk/iban-tools", :branch=>"banking_data"
+gem "activemodel", "~>4.0.0"
+gem "banking_data", "~>0.5.0"
+
+gemspec :path=>"../"
\ No newline at end of file
diff --git a/gemfiles/non_BIC.gemfile b/gemfiles/non_BIC.gemfile
new file mode 100644
index 0000000..e13f1c8
--- /dev/null
+++ b/gemfiles/non_BIC.gemfile
@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "iban-tools", :github=>"opahk/iban-tools", :branch=>"banking_data"
+
+gemspec :path=>"../"
\ No newline at end of file
diff --git a/iban_validation.gemspec b/iban_validation.gemspec
index deaa745..57e2ead 100644
--- a/iban_validation.gemspec
+++ b/iban_validation.gemspec
@@ -22,9 +22,15 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
 
   gem.add_dependency 'activemodel'
-  gem.add_dependency 'iban-tools'
+  #gem.add_dependency 'iban-tools'
   gem.add_development_dependency 'rspec'
   gem.add_development_dependency 'coveralls'
+  gem.add_development_dependency 'appraisal'
   gem.add_development_dependency 'pry'
   gem.add_development_dependency 'rubocop'
+
+  if ENV['RUBY_VERSION'] =~ /rbx/
+    gem.add_dependency 'rubysl'
+    gem.add_development_dependency 'rubinius-coverage'
+  end
 end
diff --git a/lib/iban_validation.rb b/lib/iban_validation.rb
index ff2dbe8..4973c3c 100644
--- a/lib/iban_validation.rb
+++ b/lib/iban_validation.rb
@@ -1,9 +1,12 @@
 require 'active_model'
 require 'iban-tools'
 require 'iban_validation/iban_validator'
+require 'iban_validation/known_iban_validator'
 require 'iban_validation/version'
 
 module IbanValidation
 end
 
 ActiveModel::Validations.send(:include, IbanValidation)
+I18n.load_path += Dir[File.expand_path(File.join(File.dirname(__FILE__),
+  '../locales', '*.yml')).to_s]
diff --git a/lib/iban_validation/known_iban_validator.rb b/lib/iban_validation/known_iban_validator.rb
new file mode 100644
index 0000000..89b46ed
--- /dev/null
+++ b/lib/iban_validation/known_iban_validator.rb
@@ -0,0 +1,13 @@
+module IbanValidation
+  class KnownIbanValidator < ActiveModel::EachValidator
+    def validate_each(record, attribute, values)
+      if IBANTools::IBAN.valid? values
+        if IBANTools::IBAN.new(values).to_bic.nil?
+          record.errors.add attribute, :unknown_bank
+        end
+      else
+        record.errors.add attribute, :invalid
+      end
+    end
+  end
+end
diff --git a/locales/de.yml b/locales/de.yml
new file mode 100644
index 0000000..721ed8a
--- /dev/null
+++ b/locales/de.yml
@@ -0,0 +1,4 @@
+de:
+  errors:
+    messages:
+      unknown_bank: enthaltene Bank ist unbekannt
diff --git a/locales/en.yml b/locales/en.yml
new file mode 100644
index 0000000..b944fa2
--- /dev/null
+++ b/locales/en.yml
@@ -0,0 +1,4 @@
+en:
+  errors:
+    messages:
+      unknown_bank: included bank is not known
diff --git a/spec/iban_validation/iban_validator_spec.rb b/spec/iban_validation/iban_validator_spec.rb
index 238e002..5d244fd 100644
--- a/spec/iban_validation/iban_validator_spec.rb
+++ b/spec/iban_validation/iban_validator_spec.rb
@@ -17,9 +17,14 @@ def initialize(iban)
       expect(model).to be_invalid
     end
 
-    it 'is invalid' do
+    it 'is valid' do
       model = Model.new 'GB82WEST12345698765432'
       expect(model).to be_valid
     end
+
+    it 'is valid' do
+      model = Model.new 'DE89370400440532013000'
+      expect(model).to be_valid
+    end
   end
 end
diff --git a/spec/iban_validation/known_iban_validator_spec.rb b/spec/iban_validation/known_iban_validator_spec.rb
new file mode 100644
index 0000000..fccadc2
--- /dev/null
+++ b/spec/iban_validation/known_iban_validator_spec.rb
@@ -0,0 +1,41 @@
+require 'spec_helper'
+
+module IbanValidation
+  describe KnownIbanValidator do
+    begin
+      require 'banking_data'
+
+      class KnownModel
+        include ActiveModel::Validations
+        attr_accessor :iban
+        validates :iban, known_iban: true
+
+        def initialize(iban)
+          @iban = iban
+        end
+      end
+
+      it 'is invalid' do
+        model = KnownModel.new 'DE'
+        expect(model).to be_invalid
+      end
+
+      it 'is invalid' do
+        model = KnownModel.new 'GB82WEST12345698765432'
+        expect(model).to be_invalid
+      end
+
+      it 'is valid' do
+        model = KnownModel.new 'DE89370400440532013000'
+        expect(model).to be_valid
+      end
+
+      it 'is valid' do
+        model = KnownModel.new 'DE15763500000036109724'
+        expect(model).to be_valid
+      end
+    rescue LoadError
+      pending
+    end
+  end
+end