diff --git a/PactNet.Tests/Core/MockProviderHostConfigTests.cs b/PactNet.Tests/Core/MockProviderHostConfigTests.cs
index 629efd15..b6287008 100644
--- a/PactNet.Tests/Core/MockProviderHostConfigTests.cs
+++ b/PactNet.Tests/Core/MockProviderHostConfigTests.cs
@@ -6,9 +6,9 @@ namespace PactNet.Tests.Core
 {
     public class MockProviderHostConfigTests
     {
-        private IPactCoreHostConfig GetSubject(int port = 2322, bool enableSsl = false, string consumerName = "My Test Consumer", string providerName = "My Test Provider", PactConfig pactConfig = null)
+        private IPactCoreHostConfig GetSubject(int port = 2322, bool enableSsl = false, string consumerName = "My Test Consumer", string providerName = "My Test Provider", PactConfig pactConfig = null, string host = "")
         {
-            return new MockProviderHostConfig(port, enableSsl, consumerName, providerName, pactConfig ?? new PactConfig());
+            return new MockProviderHostConfig(port, enableSsl, consumerName, providerName, pactConfig ?? new PactConfig(), host);
         }
 
         [Fact]
@@ -54,6 +54,25 @@ public void Ctor_WhenCalledWithSsl_SetsTheCorrectArgs()
             Assert.Equal(expectedArguments, config.Arguments);
         }
 
+        [Fact]
+        public void Ctor_WhenCalledWithHost_SetsTheCorrectArgs()
+        {
+            var port = 9332;
+            var pactConfig = new PactConfig();
+            var consumerName = "Cons";
+            var providerName = "The best one";
+            var enableSsl = true;
+            var host = "0.0.0.0";
+
+            var config = GetSubject(port, enableSsl, consumerName, providerName, pactConfig, host);
+
+            var expectedLogFilePath = BuildExpectedLogFilePath(pactConfig.LogDir, providerName);
+            var expectedPactDir = BuildExpectedPactDir(pactConfig.PactDir);
+            var expectedArguments = BuildExpectedArguments(port, expectedLogFilePath, expectedPactDir, pactConfig.SpecificationVersion, consumerName, providerName, enableSsl, host);
+
+            Assert.Equal(expectedArguments, config.Arguments);
+        }
+
         [Fact]
         public void Ctor_WhenCalledWithNonDefaultLogDirectory_SetsTheCorrectArgs()
         {
@@ -111,17 +130,20 @@ private string BuildExpectedPactDir(string pactDir)
         }
 
         private string BuildExpectedArguments(
-            int port, 
-            string logFilePath, 
+            int port,
+            string logFilePath,
             string pactFileDir,
             string pactSpecificationVersion,
             string consumerName,
             string providerName,
-            bool enableSsl = false)
+            bool enableSsl = false,
+            string host = "")
         {
 
             var sslOption = enableSsl ? " --ssl" : "";
-            return $"-p {port} -l \"{logFilePath}\" --pact-dir \"{pactFileDir}\" --pact-specification-version \"{pactSpecificationVersion}\" --consumer \"{consumerName}\" --provider \"{providerName}\"{sslOption}";
+            var hostOption = !string.IsNullOrWhiteSpace(host) ? $" --host={host}" : "";
+
+            return $"-p {port} -l \"{logFilePath}\" --pact-dir \"{pactFileDir}\" --pact-specification-version \"{pactSpecificationVersion}\" --consumer \"{consumerName}\" --provider \"{providerName}\"{sslOption}{hostOption}";
         }
     }
 }
diff --git a/PactNet.Tests/IntegrationTests/FailureIntegrationTestsMyApiPact.cs b/PactNet.Tests/IntegrationTests/FailureIntegrationTestsMyApiPact.cs
index f266ffef..2bc5b300 100644
--- a/PactNet.Tests/IntegrationTests/FailureIntegrationTestsMyApiPact.cs
+++ b/PactNet.Tests/IntegrationTests/FailureIntegrationTestsMyApiPact.cs
@@ -16,10 +16,10 @@ public FailureIntegrationTestsMyApiPact()
         {
             var pactConfig = new PactConfig();
 
-            PactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName) => 
+            PactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName, host) =>
                     new MockProviderService(
-                        baseUri => new RubyHttpHost(baseUri, "MyConsumer", "MyApi",  pactConfig), 
-                        port, enableSsl, 
+                        baseUri => new RubyHttpHost(baseUri, "MyConsumer", "MyApi", pactConfig),
+                        port, enableSsl,
                         baseUri => new AdminHttpClient(baseUri)))
                 .ServiceConsumer("FailureIntegrationTests")
                 .HasPactWith("MyApi");
diff --git a/PactNet.Tests/IntegrationTests/IntegrationTestsMyApiPact.cs b/PactNet.Tests/IntegrationTests/IntegrationTestsMyApiPact.cs
index 3d80ed0a..7371b7d8 100644
--- a/PactNet.Tests/IntegrationTests/IntegrationTestsMyApiPact.cs
+++ b/PactNet.Tests/IntegrationTests/IntegrationTestsMyApiPact.cs
@@ -16,7 +16,7 @@ public IntegrationTestsMyApiPact()
         {
             var pactConfig = new PactConfig();
 
-            PactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName) =>
+            PactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName, host) =>
                     new MockProviderService(
                         baseUri => new RubyHttpHost(baseUri, "MyConsumer", "MyApi", pactConfig),
                         port, enableSsl,
diff --git a/PactNet.Tests/Mocks/MockHttpService/MockProviderServiceTests.cs b/PactNet.Tests/Mocks/MockHttpService/MockProviderServiceTests.cs
index cbbd12e8..116cf680 100644
--- a/PactNet.Tests/Mocks/MockHttpService/MockProviderServiceTests.cs
+++ b/PactNet.Tests/Mocks/MockHttpService/MockProviderServiceTests.cs
@@ -19,7 +19,7 @@ public class MockProviderServiceTests
         private FakeHttpMessageHandler _fakeHttpMessageHandler;
         private int _mockHttpHostFactoryCallCount;
 
-        private IMockProviderService GetSubject(int port = 1234, bool enableSsl = false)
+        private IMockProviderService GetSubject(int port = 1234, bool enableSsl = false, string host = "")
         {
             _mockHttpHost = Substitute.For<IHttpHost>();
             _fakeHttpMessageHandler = new FakeHttpMessageHandler();
@@ -33,7 +33,8 @@ private IMockProviderService GetSubject(int port = 1234, bool enableSsl = false)
                 },
                 port,
                 enableSsl,
-                baseUri => new AdminHttpClient(baseUri, _fakeHttpMessageHandler));
+                baseUri => new AdminHttpClient(baseUri, _fakeHttpMessageHandler),
+                host);
         }
 
         [Fact]
@@ -51,7 +52,7 @@ public void Ctor_WhenCalledWithEnableSslFalse_SetsBaseUriWithHttpScheme()
         {
             var mockService = GetSubject(enableSsl: false);
 
-            Assert.True(((MockProviderService)mockService).BaseUri.Scheme.ToUpperInvariant().Equals("HTTP"), "BaseUri has a http scheme");
+            Assert.True(((MockProviderService)mockService).BaseUri.Scheme.Equals("HTTP", StringComparison.OrdinalIgnoreCase), "BaseUri has a http scheme");
         }
 
         [Fact]
@@ -59,7 +60,15 @@ public void Ctor_WhenCalledWithEnableSslTrue_SetsBaseUriWithHttpsScheme()
         {
             var mockService = GetSubject(enableSsl: true);
 
-            Assert.True(((MockProviderService)mockService).BaseUri.Scheme.ToUpperInvariant().Equals("HTTPS"), "BaseUri has a https scheme");
+            Assert.True(((MockProviderService)mockService).BaseUri.Scheme.Equals("HTTPS", StringComparison.OrdinalIgnoreCase), "BaseUri has a https scheme");
+        }
+
+        [Fact]
+        public void Ctor_WhenCalledWithHost_UsesTheHostInsteadOfLocalhost()
+        {
+            var mockService = GetSubject(host: "0.0.0.0");
+
+            Assert.True(((MockProviderService)mockService).BaseUri.Host.Equals("0.0.0.0"), "BaseUri has a 0.0.0.0  as a host");
         }
 
         [Fact]
diff --git a/PactNet.Tests/PactBuilderTests.cs b/PactNet.Tests/PactBuilderTests.cs
index 9d1c776a..60a4bd43 100644
--- a/PactNet.Tests/PactBuilderTests.cs
+++ b/PactNet.Tests/PactBuilderTests.cs
@@ -75,7 +75,7 @@ public void MockService_WhenCalled_StartIsCalledAndMockProviderServiceIsReturned
         {
             var mockMockProviderService = Substitute.For<IMockProviderService>();
 
-            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName) => mockMockProviderService);
+            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName, host) => mockMockProviderService);
 
             pactBuilder
                 .ServiceConsumer("Event Client")
@@ -92,7 +92,7 @@ public void MockService_WhenCalledTwice_StopIsCalledTheSecondTime()
         {
             var mockMockProviderService = Substitute.For<IMockProviderService>();
 
-            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName) => mockMockProviderService);
+            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName, host) => mockMockProviderService);
 
             pactBuilder
                 .ServiceConsumer("Event Client")
@@ -111,7 +111,7 @@ public void MockService_WhenCalled_MockProviderServiceFactoryIsInvokedWithSslNot
             var calledWithSslEnabled = false;
             var mockMockProviderService = Substitute.For<IMockProviderService>();
 
-            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName) =>
+            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName, host) =>
             {
                 calledWithSslEnabled = enableSsl;
                 return mockMockProviderService;
@@ -132,7 +132,7 @@ public void MockService_WhenCalledWithEnableSslFalse_MockProviderServiceFactoryI
             var calledWithSslEnabled = false;
             var mockMockProviderService = Substitute.For<IMockProviderService>();
 
-            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName) =>
+            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName, host) =>
             {
                 calledWithSslEnabled = enableSsl;
                 return mockMockProviderService;
@@ -153,7 +153,7 @@ public void MockService_WhenCalledWithEnableSslTrue_MockProviderServiceFactoryIs
             var calledWithSslEnabled = false;
             var mockMockProviderService = Substitute.For<IMockProviderService>();
 
-            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName) =>
+            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName, host) =>
             {
                 calledWithSslEnabled = enableSsl;
                 return mockMockProviderService;
@@ -174,7 +174,7 @@ public void MockService_WhenCalledWithJsonSerializerSettings_SetsTheGlobalApiSer
             var serializerSettings = new JsonSerializerSettings();
             var mockMockProviderService = Substitute.For<IMockProviderService>();
 
-            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName) => mockMockProviderService);
+            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName, host) => mockMockProviderService);
 
             pactBuilder
                 .ServiceConsumer("Event Client")
@@ -197,7 +197,7 @@ public void MockService_WhenCalledWithNoJsonSerializerSettings_DoesNotSetTheGlob
         {
             var mockMockProviderService = Substitute.For<IMockProviderService>();
 
-            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName) => mockMockProviderService);
+            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName, host) => mockMockProviderService);
 
             pactBuilder
                 .ServiceConsumer("Event Client")
@@ -211,7 +211,7 @@ public void MockService_WhenCalledWithNoJsonSerializerSettings_DoesNotSetTheGlob
         [Fact]
         public void MockService_WhenCalledWithoutConsumerNameSet_ThrowsInvalidOperationException()
         {
-            IPactBuilder pactBuilder = new PactBuilder((port, ssl, consumerName, providerName) => Substitute.For<IMockProviderService>());
+            IPactBuilder pactBuilder = new PactBuilder((port, ssl, consumerName, providerName, host) => Substitute.For<IMockProviderService>());
             pactBuilder
                 .HasPactWith("Event API");
 
@@ -221,7 +221,7 @@ public void MockService_WhenCalledWithoutConsumerNameSet_ThrowsInvalidOperationE
         [Fact]
         public void MockService_WhenCalledWithoutProviderNameSet_ThrowsInvalidOperationException()
         {
-            IPactBuilder pactBuilder = new PactBuilder((port, ssl, consumerName, providerName) => Substitute.For<IMockProviderService>());
+            IPactBuilder pactBuilder = new PactBuilder((port, ssl, consumerName, providerName, hsot) => Substitute.For<IMockProviderService>());
             pactBuilder
                 .ServiceConsumer("Event Client");
 
@@ -243,7 +243,7 @@ public void Build_WhenCalledWithTheMockProviderServiceInitialised_CallsSendAdmin
             const string testProviderName = "Event API";
             var mockProviderService = Substitute.For<IMockProviderService>();
 
-            IPactBuilder pactBuilder = new PactBuilder((port, ssl, consumerName, providerName) => mockProviderService);
+            IPactBuilder pactBuilder = new PactBuilder((port, ssl, consumerName, providerName, host) => mockProviderService);
             pactBuilder
                 .ServiceConsumer(testConsumerName)
                 .HasPactWith(testProviderName);
@@ -260,7 +260,7 @@ public void Build_WhenCalledWithAnInitialisedMockProviderService_StopIsCalledOnT
         {
             var mockMockProviderService = Substitute.For<IMockProviderService>();
 
-            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName) => mockMockProviderService)
+            IPactBuilder pactBuilder = new PactBuilder((port, enableSsl, consumerName, providerName, host) => mockMockProviderService)
                 .ServiceConsumer("Event Client")
                 .HasPactWith("Event API");
 
diff --git a/PactNet/Core/MockProviderHostConfig.cs b/PactNet/Core/MockProviderHostConfig.cs
index 9fc35cd9..cc6326b5 100644
--- a/PactNet/Core/MockProviderHostConfig.cs
+++ b/PactNet/Core/MockProviderHostConfig.cs
@@ -11,13 +11,14 @@ internal class MockProviderHostConfig : IPactCoreHostConfig
         public bool WaitForExit { get; }
         public IEnumerable<IOutput> Outputters { get; }
 
-        public MockProviderHostConfig(int port, bool enableSsl, string consumerName, string providerName, PactConfig config)
+        public MockProviderHostConfig(int port, bool enableSsl, string consumerName, string providerName, PactConfig config, string host = "")
         {
             var logFile = $"{config.LogDir}{providerName.ToLowerSnakeCase()}_mock_service.log";
             var sslOption = enableSsl ? " --ssl" : "";
+            var hostOption = string.IsNullOrWhiteSpace(host) ? "" : $" --host={host}";
 
             Script = "pact-mock-service";
-            Arguments = $"-p {port} -l \"{FixPathForRuby(logFile)}\" --pact-dir \"{FixPathForRuby(config.PactDir)}\" --pact-specification-version \"{config.SpecificationVersion}\" --consumer \"{consumerName}\" --provider \"{providerName}\"{sslOption}";
+            Arguments = $"-p {port} -l \"{FixPathForRuby(logFile)}\" --pact-dir \"{FixPathForRuby(config.PactDir)}\" --pact-specification-version \"{config.SpecificationVersion}\" --consumer \"{consumerName}\" --provider \"{providerName}\"{sslOption}{hostOption}";
             WaitForExit = false;
             Outputters = config?.Outputters;
         }
diff --git a/PactNet/IPactBuilder.cs b/PactNet/IPactBuilder.cs
index a6fbbc57..c8a6c3c9 100644
--- a/PactNet/IPactBuilder.cs
+++ b/PactNet/IPactBuilder.cs
@@ -7,8 +7,8 @@ public interface IPactBuilder
     {
         IPactBuilder ServiceConsumer(string consumerName);
         IPactBuilder HasPactWith(string providerName);
-        IMockProviderService MockService(int port, bool enableSsl = false);
-        IMockProviderService MockService(int port, JsonSerializerSettings jsonSerializerSettings, bool enableSsl = false);        
+        IMockProviderService MockService(int port, bool enableSsl = false, string host = "");
+        IMockProviderService MockService(int port, JsonSerializerSettings jsonSerializerSettings, bool enableSsl = false, string host = "");
         void Build();
     }
 }
\ No newline at end of file
diff --git a/PactNet/Mocks/MockHttpService/Host/RubyHttpHost.cs b/PactNet/Mocks/MockHttpService/Host/RubyHttpHost.cs
index ba715f9d..880e5800 100644
--- a/PactNet/Mocks/MockHttpService/Host/RubyHttpHost.cs
+++ b/PactNet/Mocks/MockHttpService/Host/RubyHttpHost.cs
@@ -11,19 +11,21 @@ internal class RubyHttpHost : IHttpHost
         private readonly AdminHttpClient _adminHttpClient;
 
         internal RubyHttpHost(
-            IPactCoreHost coreHost, 
+            IPactCoreHost coreHost,
             AdminHttpClient adminHttpClient)
         {
             _coreHost = coreHost;
             _adminHttpClient = adminHttpClient;
         }
 
-        public RubyHttpHost(Uri baseUri, string consumerName, string providerName, PactConfig config) : 
+        public RubyHttpHost(Uri baseUri, string consumerName, string providerName, PactConfig config) :
             this(new PactCoreHost<MockProviderHostConfig>(
-                new MockProviderHostConfig(baseUri.Port, 
-                    baseUri.Scheme.ToUpperInvariant().Equals("HTTPS"), 
+                new MockProviderHostConfig(baseUri.Port,
+                    baseUri.Scheme.Equals("HTTPS", StringComparison.OrdinalIgnoreCase),
                     consumerName,
-                    providerName, config)),
+                    providerName,
+                    config,
+                    baseUri.Host)),
                 new AdminHttpClient(baseUri))
         {
         }
@@ -35,7 +37,7 @@ private Tuple<bool, Exception> IsMockProviderServiceRunning()
                 _adminHttpClient.SendAdminHttpRequest(HttpVerb.Get, "/");
                 return new Tuple<bool, Exception>(true, null);
             }
-            catch(Exception ex)
+            catch (Exception ex)
             {
                 return new Tuple<bool, Exception>(false, ex);
             }
diff --git a/PactNet/Mocks/MockHttpService/MockProviderService.cs b/PactNet/Mocks/MockHttpService/MockProviderService.cs
index ba66b682..6a51396d 100644
--- a/PactNet/Mocks/MockHttpService/MockProviderService.cs
+++ b/PactNet/Mocks/MockHttpService/MockProviderService.cs
@@ -23,19 +23,22 @@ internal MockProviderService(
             Func<Uri, IHttpHost> hostFactory,
             int port,
             bool enableSsl,
-            Func<Uri, AdminHttpClient> adminHttpClientFactory)
+            Func<Uri, AdminHttpClient> adminHttpClientFactory,
+            string host = "")
         {
             _hostFactory = hostFactory;
-            BaseUri = new Uri($"{(enableSsl ? "https" : "http")}://localhost:{port}");
+            BaseUri = new Uri(
+                $"{(enableSsl ? "https" : "http")}://{(IsNullOrWhiteSpace(host) ? "localhost" : host)}:{port}");
             _adminHttpClient = adminHttpClientFactory(BaseUri);
         }
 
-        public MockProviderService(int port, bool enableSsl, string consumerName, string providerName, PactConfig config)
+        public MockProviderService(int port, bool enableSsl, string consumerName, string providerName, PactConfig config, string host = "")
             : this(
             baseUri => new RubyHttpHost(baseUri, consumerName, providerName, config),
             port,
             enableSsl,
-            baseUri => new AdminHttpClient(baseUri))
+            baseUri => new AdminHttpClient(baseUri),
+            host)
         {
         }
 
@@ -81,7 +84,7 @@ public IMockProviderService With(ProviderServiceRequest request)
             }
 
             _request = request;
-            
+
             return this;
         }
 
diff --git a/PactNet/PactBuilder.cs b/PactNet/PactBuilder.cs
index 2a12c9b4..d2bc967d 100644
--- a/PactNet/PactBuilder.cs
+++ b/PactNet/PactBuilder.cs
@@ -11,10 +11,11 @@ public class PactBuilder : IPactBuilder
     {
         public string ConsumerName { get; private set; }
         public string ProviderName { get; private set; }
-        private readonly Func<int, bool, string, string, IMockProviderService> _mockProviderServiceFactory;
+        private readonly Func<int, bool, string, string, string, IMockProviderService> _mockProviderServiceFactory;
+
         private IMockProviderService _mockProviderService;
 
-        internal PactBuilder(Func<int, bool, string, string, IMockProviderService> mockProviderServiceFactory)
+        internal PactBuilder(Func<int, bool, string, string, string, IMockProviderService> mockProviderServiceFactory)
         {
             _mockProviderServiceFactory = mockProviderServiceFactory;
         }
@@ -25,7 +26,7 @@ public PactBuilder()
         }
 
         public PactBuilder(PactConfig config)
-            : this((port, enableSsl, consumerName, providerName) => new MockProviderService(port, enableSsl, consumerName, providerName, config))
+            : this((port, enableSsl, consumerName, providerName, host) => new MockProviderService(port, enableSsl, consumerName, providerName, config, host))
         {
         }
 
@@ -53,12 +54,12 @@ public IPactBuilder HasPactWith(string providerName)
             return this;
         }
 
-        public IMockProviderService MockService(int port, bool enableSsl = false)
+        public IMockProviderService MockService(int port, bool enableSsl = false, string host = "")
         {
-            return MockService(port, jsonSerializerSettings: null, enableSsl: enableSsl);
+            return MockService(port, jsonSerializerSettings: null, enableSsl: enableSsl, host: host);
         }
-    
-        public IMockProviderService MockService(int port, JsonSerializerSettings jsonSerializerSettings, bool enableSsl = false)
+
+        public IMockProviderService MockService(int port, JsonSerializerSettings jsonSerializerSettings, bool enableSsl = false, string host = "")
         {
             if (String.IsNullOrEmpty(ConsumerName))
             {
@@ -80,7 +81,7 @@ public IMockProviderService MockService(int port, JsonSerializerSettings jsonSer
                 JsonConfig.ApiSerializerSettings = jsonSerializerSettings;
             }
 
-            _mockProviderService = _mockProviderServiceFactory(port, enableSsl, ConsumerName, ProviderName);
+            _mockProviderService = _mockProviderServiceFactory(port, enableSsl, ConsumerName, ProviderName, host);
 
             _mockProviderService.Start();