diff --git a/docs/networks.md b/docs/networks.md
index 0922cd1..e8a54e2 100644
--- a/docs/networks.md
+++ b/docs/networks.md
@@ -3,6 +3,23 @@ Bitcore provides support for the main bitcoin network as well as for `testnet3`,
 
 The `Network` namespace has a function, `get(...)` that returns an instance of a `Network` or `undefined`. The only argument to this function is some kind of identifier of the network: either its name, a reference to a Network object, or a number used as a magic constant to identify the network (for example, the value `0` that gives bitcoin addresses the distinctive `'1'` at its beginning on livenet, is a `0x6F` for testnet).
 
+## Regtest
+
+The regtest network is useful for development as it's possible to programmatically and instantly generate blocks for testing. It's currently supported as a variation of testnet. Here is an example of how to use regtest with the Bitcore Library:
+
+```js
+// Standard testnet
+> bitcore.Networks.testnet.networkMagic;
+<Buffer 0b 11 09 07>
+```
+
+```js
+// Enabling testnet to use the regtest port and magicNumber
+> bitcore.Networks.enableRegtest();
+> bitcore.Networks.testnet.networkMagic;
+<Buffer fa bf b5 da>
+```
+
 ## Setting the Default Network
 Most projects will only need to work with one of the networks. The value of `Networks.defaultNetwork` can be set to `Networks.testnet` if the project will need to only to work on testnet (the default is `Networks.livenet`).
 
diff --git a/lib/networks.js b/lib/networks.js
index 3ea7c01..3a9381c 100644
--- a/lib/networks.js
+++ b/lib/networks.js
@@ -75,12 +75,26 @@ function addNetwork(data) {
     privatekey: data.privatekey,
     scripthash: data.scripthash,
     xpubkey: data.xpubkey,
-    xprivkey: data.xprivkey,
-    networkMagic: BufferUtil.integerAsBuffer(data.networkMagic),
-    port: data.port,
-    dnsSeeds: data.dnsSeeds
+    xprivkey: data.xprivkey
   });
 
+  if (data.networkMagic) {
+    JSUtil.defineImmutable(network, {
+      networkMagic: BufferUtil.integerAsBuffer(data.networkMagic)
+    });
+  }
+
+  if (data.port) {
+    JSUtil.defineImmutable(network, {
+      port: data.port
+    });
+  }
+
+  if (data.dnsSeeds) {
+    JSUtil.defineImmutable(network, {
+      dnsSeeds: data.dnsSeeds
+    });
+  }
   _.each(network, function(value) {
     if (!_.isUndefined(value) && !_.isObject(value)) {
       networkMaps[value] = network;
@@ -132,36 +146,113 @@ addNetwork({
   ]
 });
 
-addNetwork({
-  name: 'testnet',
-  alias: 'testnet',
-  pubkeyhash: 0x6f,
-  privatekey: 0xef,
-  scripthash: 0xc4,
-  xpubkey: 0x043587cf,
-  xprivkey: 0x04358394,
-  networkMagic: 0x0b110907,
-  port: 18333,
-  dnsSeeds: [
-    'testnet-seed.bitcoin.petertodd.org',
-    'testnet-seed.bluematt.me',
-    'testnet-seed.alexykot.me',
-    'testnet-seed.bitcoin.schildbach.de'
-  ],
-});
-
 /**
  * @instance
  * @member Networks#livenet
  */
 var livenet = get('livenet');
 
+addNetwork({
+  name: 'testnet',
+  alias: 'regtest',
+  pubkeyhash: 0x6f,
+  privatekey: 0xef,
+  scripthash: 0xc4,
+  xpubkey: 0x043587cf,
+  xprivkey: 0x04358394
+});
+
 /**
  * @instance
  * @member Networks#testnet
  */
 var testnet = get('testnet');
 
+// Add configurable values for testnet/regtest
+
+var TESTNET = {
+  PORT: 18333,
+  NETWORK_MAGIC: BufferUtil.integerAsBuffer(0x0b110907),
+  DNS_SEEDS: [
+    'testnet-seed.bitcoin.petertodd.org',
+    'testnet-seed.bluematt.me',
+    'testnet-seed.alexykot.me',
+    'testnet-seed.bitcoin.schildbach.de'
+  ]
+};
+
+for (var key in TESTNET) {
+  if (!_.isObject(TESTNET[key])) {
+    networkMaps[TESTNET[key]] = testnet;
+  }
+}
+
+var REGTEST = {
+  PORT: 18444,
+  NETWORK_MAGIC: BufferUtil.integerAsBuffer(0xfabfb5da),
+  DNS_SEEDS: []
+};
+
+for (var key in REGTEST) {
+  if (!_.isObject(REGTEST[key])) {
+    networkMaps[REGTEST[key]] = testnet;
+  }
+}
+
+Object.defineProperty(testnet, 'port', {
+  enumerable: true,
+  configurable: false,
+  get: function() {
+    if (this.regtestEnabled) {
+      return REGTEST.PORT;
+    } else {
+      return TESTNET.PORT;
+    }
+  }
+});
+
+Object.defineProperty(testnet, 'networkMagic', {
+  enumerable: true,
+  configurable: false,
+  get: function() {
+    if (this.regtestEnabled) {
+      return REGTEST.NETWORK_MAGIC;
+    } else {
+      return TESTNET.NETWORK_MAGIC;
+    }
+  }
+});
+
+Object.defineProperty(testnet, 'dnsSeeds', {
+  enumerable: true,
+  configurable: false,
+  get: function() {
+    if (this.regtestEnabled) {
+      return REGTEST.DNS_SEEDS;
+    } else {
+      return TESTNET.DNS_SEEDS;
+    }
+  }
+});
+
+/**
+ * @function
+ * @member Networks#enableRegtest
+ * Will enable regtest features for testnet
+ */
+function enableRegtest() {
+  testnet.regtestEnabled = true;
+}
+
+/**
+ * @function
+ * @member Networks#disableRegtest
+ * Will disable regtest features for testnet
+ */
+function disableRegtest() {
+  testnet.regtestEnabled = false;
+}
+
 /**
  * @namespace Networks
  */
@@ -172,5 +263,7 @@ module.exports = {
   livenet: livenet,
   mainnet: livenet,
   testnet: testnet,
-  get: get
+  get: get,
+  enableRegtest: enableRegtest,
+  disableRegtest: disableRegtest
 };
diff --git a/test/networks.js b/test/networks.js
index c3f9b8b..7d82f92 100644
--- a/test/networks.js
+++ b/test/networks.js
@@ -15,6 +15,29 @@ describe('Networks', function() {
     should.exist(networks.defaultNetwork);
   });
 
+  it('will enable/disable regtest Network', function() {
+    networks.enableRegtest();
+    networks.testnet.networkMagic.should.deep.equal(new Buffer('fabfb5da', 'hex'));
+    networks.testnet.port.should.equal(18444);
+    networks.testnet.dnsSeeds.should.deep.equal([]);
+    networks.testnet.regtestEnabled.should.equal(true);
+
+    networks.disableRegtest();
+    networks.testnet.networkMagic.should.deep.equal(new Buffer('0b110907', 'hex'));
+    networks.testnet.port.should.equal(18333);
+    networks.testnet.dnsSeeds.should.deep.equal([
+      'testnet-seed.bitcoin.petertodd.org',
+      'testnet-seed.bluematt.me',
+      'testnet-seed.alexykot.me',
+      'testnet-seed.bitcoin.schildbach.de'
+    ]);
+  });
+
+  it('will get network based on string "regtest" value', function() {
+    var network = networks.get('regtest');
+    network.should.equal(networks.testnet);
+  });
+
   it('should be able to define a custom Network', function() {
     var custom = {
       name: 'customnet',