diff --git a/lib/correios/cep/parser.rb b/lib/correios/cep/parser.rb
index a878473..00a2b0a 100644
--- a/lib/correios/cep/parser.rb
+++ b/lib/correios/cep/parser.rb
@@ -1,5 +1,3 @@
-require 'ox'
-
 module Correios
   module CEP
     class Parser
@@ -13,6 +11,18 @@ class Parser
         'complemento2' => :complement2
       }.freeze
 
+      ADDRESS_NOT_FOUND_ERROR = 'CEP NAO ENCONTRADO'
+
+      def address(xml)
+        address = Address.parse(xml)
+        return address if address.has_content?
+
+        error_message = extract_error_message(xml)
+        return nil if error_message == ADDRESS_NOT_FOUND_ERROR
+
+        raise error_message || 'Unknown error'
+      end
+
       def hash(xml)
         doc = Ox.parse(xml)
 
@@ -30,6 +40,10 @@ def hash(xml)
 
       private
 
+      def extract_error_message(xml)
+        return $1 if xml =~ /<faultstring>(.*)<\/faultstring>/
+      end
+
       def find_node(nodes, name)
         node = nodes.last
         return nil unless node.is_a?(Ox::Element)
diff --git a/spec/correios/cep/parser_spec.rb b/spec/correios/cep/parser_spec.rb
index 658708e..0209a26 100644
--- a/spec/correios/cep/parser_spec.rb
+++ b/spec/correios/cep/parser_spec.rb
@@ -2,6 +2,47 @@
 require 'spec_helper'
 
 describe Correios::CEP::Parser do
+  describe '#address' do
+    let(:expected_address) do
+      address = Correios::CEP::Address.new
+      address.street_address = 'Rua Fernando Amorim'
+      address.neighborhood = 'Cavaleiro'
+      address.city = 'Jaboatão dos Guararapes'
+      address.state = 'PE'
+      address.zipcode = '54250610'
+      address
+    end
+
+    context 'when address is found' do
+      let(:xml) { Fixture.load(:address) }
+
+      it 'returns address' do
+        expect(subject.address(xml)).to eq expected_address
+      end
+    end
+
+    context 'when address is not found' do
+      let(:xml) { Fixture.load(:address_not_found) }
+
+      it 'returns nil' do
+        expect(subject.address(xml)).to eq nil
+      end
+    end
+
+    context 'when there is an unexpected error' do
+      { invalid_zipcode: 'BUSCA DEFINIDA COMO EXATA, 0 CEP DEVE TER 8 DIGITOS',
+        required_zipcode: 'CEP NAO INFORMADO',
+        whatever_error: 'QUALQUER OUTRO ERRO',
+        empty_response: 'Unknown error'
+      }.each do |name, message|
+        it 'raises RuntimeError exception' do
+          xml = Fixture.load(name)
+          expect { subject.address(xml) }.to raise_error(RuntimeError, message)
+        end
+      end
+    end
+  end
+
   describe '#hash' do
     let(:expected_address) do
       {
diff --git a/spec/fixtures/empty_response.xml b/spec/fixtures/empty_response.xml
new file mode 100644
index 0000000..e69de29
diff --git a/spec/fixtures/invalid_zipcode.xml b/spec/fixtures/invalid_zipcode.xml
new file mode 100644
index 0000000..e4867af
--- /dev/null
+++ b/spec/fixtures/invalid_zipcode.xml
@@ -0,0 +1,11 @@
+<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
+  <soap:Body>
+    <soap:Fault>
+      <faultcode>soap:Server</faultcode>
+      <faultstring>BUSCA DEFINIDA COMO EXATA, 0 CEP DEVE TER 8 DIGITOS</faultstring>
+      <detail>
+        <ns2:SigepClienteException xmlns:ns2="http://cliente.bean.master.sigep.bsb.correios.com.br/">BUSCA DEFINIDA COMO EXATA, 0 CEP DEVE TER 8 DIGITOS</ns2:SigepClienteException>
+      </detail>
+    </soap:Fault>
+  </soap:Body>
+</soap:Envelope>
diff --git a/spec/fixtures/required_zipcode.xml b/spec/fixtures/required_zipcode.xml
new file mode 100644
index 0000000..6373008
--- /dev/null
+++ b/spec/fixtures/required_zipcode.xml
@@ -0,0 +1,11 @@
+<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
+  <soap:Body>
+    <soap:Fault>
+      <faultcode>soap:Server</faultcode>
+      <faultstring>CEP NAO INFORMADO</faultstring>
+      <detail>
+        <ns2:SigepClienteException xmlns:ns2="http://cliente.bean.master.sigep.bsb.correios.com.br/">CEP NAO INFORMADO</ns2:SigepClienteException>
+      </detail>
+    </soap:Fault>
+  </soap:Body>
+</soap:Envelope>
diff --git a/spec/fixtures/whatever_error.xml b/spec/fixtures/whatever_error.xml
new file mode 100644
index 0000000..287990a
--- /dev/null
+++ b/spec/fixtures/whatever_error.xml
@@ -0,0 +1,11 @@
+<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
+  <soap:Body>
+    <soap:Fault>
+      <faultcode>soap:Server</faultcode>
+      <faultstring>QUALQUER OUTRO ERRO</faultstring>
+      <detail>
+        <ns2:SigepClienteException xmlns:ns2="http://cliente.bean.master.sigep.bsb.correios.com.br/">QUALQUER OUTRO ERRO</ns2:SigepClienteException>
+      </detail>
+    </soap:Fault>
+  </soap:Body>
+</soap:Envelope>