diff --git a/core/src/main/java/com/google/bitcoin/core/NetworkParameters.java b/core/src/main/java/com/google/bitcoin/core/NetworkParameters.java
index cc34ceff..02f2e936 100644
--- a/core/src/main/java/com/google/bitcoin/core/NetworkParameters.java
+++ b/core/src/main/java/com/google/bitcoin/core/NetworkParameters.java
@@ -61,8 +61,7 @@ public class NetworkParameters implements Serializable {
     private final Block genesisBlock;
     /** What the easiest allowable proof of work should be. */
     public /*final*/ BigInteger proofOfWorkLimit;
-    /** Default TCP port on which to connect to nodes. */
-    public final int port;
+    private final int port;
     /** The header bytes that identify the start of a packet on this network. */
     public final long packetMagic;
     /**
@@ -393,4 +392,9 @@ public class NetworkParameters implements Serializable {
     public Block getGenesisBlock() {
         return genesisBlock;
     }
+
+    /** Default TCP port on which to connect to nodes. */
+    public int getPort() {
+        return port;
+    }
 }
diff --git a/core/src/main/java/com/google/bitcoin/core/PeerAddress.java b/core/src/main/java/com/google/bitcoin/core/PeerAddress.java
index ced43a68..909cf545 100644
--- a/core/src/main/java/com/google/bitcoin/core/PeerAddress.java
+++ b/core/src/main/java/com/google/bitcoin/core/PeerAddress.java
@@ -90,7 +90,7 @@ public class PeerAddress extends ChildMessage {
      * Constructs a peer address from the given IP address. Port and protocol version are default for the prodnet.
      */
     public PeerAddress(InetAddress addr) {
-        this(addr, NetworkParameters.prodNet().port);
+        this(addr, NetworkParameters.prodNet().getPort());
     }
 
     public PeerAddress(InetSocketAddress addr) {
diff --git a/core/src/main/java/com/google/bitcoin/core/PeerGroup.java b/core/src/main/java/com/google/bitcoin/core/PeerGroup.java
index 413e8eff..e78101a3 100644
--- a/core/src/main/java/com/google/bitcoin/core/PeerGroup.java
+++ b/core/src/main/java/com/google/bitcoin/core/PeerGroup.java
@@ -485,7 +485,7 @@ public class PeerGroup extends AbstractIdleService {
 
     /** Convenience method for addAddress(new PeerAddress(address, params.port)); */
     public void addAddress(InetAddress address) {
-        addAddress(new PeerAddress(address, params.port));
+        addAddress(new PeerAddress(address, params.getPort()));
     }
 
     /**
diff --git a/core/src/main/java/com/google/bitcoin/core/TCPNetworkConnection.java b/core/src/main/java/com/google/bitcoin/core/TCPNetworkConnection.java
index 06423101..812d720b 100644
--- a/core/src/main/java/com/google/bitcoin/core/TCPNetworkConnection.java
+++ b/core/src/main/java/com/google/bitcoin/core/TCPNetworkConnection.java
@@ -178,7 +178,7 @@ public class TCPNetworkConnection implements NetworkConnection {
 
     @Override
     public String toString() {
-        return "[" + remoteIp.getHostAddress() + "]:" + params.port;
+        return "[" + remoteIp.getHostAddress() + "]:" + params.getPort();
     }
 
     public class NetworkHandler extends ReplayingDecoder<VoidEnum> implements ChannelDownstreamHandler {
@@ -244,7 +244,7 @@ public class TCPNetworkConnection implements NetworkConnection {
     }
 
     public PeerAddress getPeerAddress() {
-        return new PeerAddress(remoteIp, params.port);
+        return new PeerAddress(remoteIp, params.getPort());
     }
 
     public void close() {
diff --git a/core/src/main/java/com/google/bitcoin/core/VersionMessage.java b/core/src/main/java/com/google/bitcoin/core/VersionMessage.java
index 0eea1c01..88dedf70 100644
--- a/core/src/main/java/com/google/bitcoin/core/VersionMessage.java
+++ b/core/src/main/java/com/google/bitcoin/core/VersionMessage.java
@@ -101,8 +101,8 @@ public class VersionMessage extends Message {
             // We hard-code the IPv4 localhost address here rather than use InetAddress.getLocalHost() because some
             // mobile phones have broken localhost DNS entries, also, this is faster.
             final byte[] localhost = new byte[] { 127, 0, 0, 1 };
-            myAddr = new PeerAddress(InetAddress.getByAddress(localhost), params.port, 0);
-            theirAddr = new PeerAddress(InetAddress.getByAddress(localhost), params.port, 0);
+            myAddr = new PeerAddress(InetAddress.getByAddress(localhost), params.getPort(), 0);
+            theirAddr = new PeerAddress(InetAddress.getByAddress(localhost), params.getPort(), 0);
         } catch (UnknownHostException e) {
             throw new RuntimeException(e);  // Cannot happen (illegal IP length).
         }
diff --git a/core/src/main/java/com/google/bitcoin/discovery/DnsDiscovery.java b/core/src/main/java/com/google/bitcoin/discovery/DnsDiscovery.java
index c55b48cf..f9e33a2d 100644
--- a/core/src/main/java/com/google/bitcoin/discovery/DnsDiscovery.java
+++ b/core/src/main/java/com/google/bitcoin/discovery/DnsDiscovery.java
@@ -94,7 +94,7 @@ public class DnsDiscovery implements PeerDiscovery {
                     continue;
                 }
                 for (InetAddress addr : inetAddresses) {
-                    addrs.add(new InetSocketAddress(addr, netParams.port));
+                    addrs.add(new InetSocketAddress(addr, netParams.getPort()));
                 }
             }
             if (addrs.size() == 0)
diff --git a/core/src/main/java/com/google/bitcoin/discovery/SeedPeers.java b/core/src/main/java/com/google/bitcoin/discovery/SeedPeers.java
index 0358ecf2..c165f6ce 100644
--- a/core/src/main/java/com/google/bitcoin/discovery/SeedPeers.java
+++ b/core/src/main/java/com/google/bitcoin/discovery/SeedPeers.java
@@ -53,7 +53,7 @@ public class SeedPeers implements PeerDiscovery {
     private InetSocketAddress nextPeer() throws UnknownHostException {
         if (pnseedIndex >= seedAddrs.length) return null;
         return new InetSocketAddress(convertAddress(seedAddrs[pnseedIndex++]),
-                params.port);
+                params.getPort());
     }
 
     /**
@@ -70,7 +70,7 @@ public class SeedPeers implements PeerDiscovery {
     private InetSocketAddress[] allPeers() throws UnknownHostException {
         InetSocketAddress[] addresses = new InetSocketAddress[seedAddrs.length];
         for (int i = 0; i < seedAddrs.length; ++i) {
-            addresses[i] = new InetSocketAddress(convertAddress(seedAddrs[i]), params.port);
+            addresses[i] = new InetSocketAddress(convertAddress(seedAddrs[i]), params.getPort());
         }
         return addresses;
     }
diff --git a/examples/src/main/java/com/google/bitcoin/examples/FetchBlock.java b/examples/src/main/java/com/google/bitcoin/examples/FetchBlock.java
index 97d6997f..9e5d7731 100644
--- a/examples/src/main/java/com/google/bitcoin/examples/FetchBlock.java
+++ b/examples/src/main/java/com/google/bitcoin/examples/FetchBlock.java
@@ -37,7 +37,7 @@ public class FetchBlock {
         BlockChain chain = new BlockChain(params, blockStore);
         PeerGroup peerGroup = new PeerGroup(params, chain);
         peerGroup.startAndWait();
-        PeerAddress addr = new PeerAddress(InetAddress.getLocalHost(), params.port);
+        PeerAddress addr = new PeerAddress(InetAddress.getLocalHost(), params.getPort());
         peerGroup.addAddress(addr);
         peerGroup.waitForPeers(1).get();
         Peer peer = peerGroup.getConnectedPeers().get(0);
diff --git a/examples/src/main/java/com/google/bitcoin/examples/FetchTransactions.java b/examples/src/main/java/com/google/bitcoin/examples/FetchTransactions.java
index bb7f0a6a..41c79165 100644
--- a/examples/src/main/java/com/google/bitcoin/examples/FetchTransactions.java
+++ b/examples/src/main/java/com/google/bitcoin/examples/FetchTransactions.java
@@ -38,7 +38,7 @@ public class FetchTransactions {
         BlockChain chain = new BlockChain(params, blockStore);
         PeerGroup peerGroup = new PeerGroup(params, chain);
         peerGroup.startAndWait();
-        peerGroup.addAddress(new PeerAddress(InetAddress.getLocalHost(), params.port));
+        peerGroup.addAddress(new PeerAddress(InetAddress.getLocalHost(), params.getPort()));
         peerGroup.waitForPeers(1).get();
         Peer peer = peerGroup.getConnectedPeers().get(0);
 
diff --git a/examples/src/main/java/com/google/bitcoin/examples/PrintPeers.java b/examples/src/main/java/com/google/bitcoin/examples/PrintPeers.java
index d87ea9ee..07c6cbba 100644
--- a/examples/src/main/java/com/google/bitcoin/examples/PrintPeers.java
+++ b/examples/src/main/java/com/google/bitcoin/examples/PrintPeers.java
@@ -76,7 +76,7 @@ public class PrintPeers {
         List<ListenableFuture<TCPNetworkConnection>> futures = Lists.newArrayList();
         for (final InetAddress addr : addrs) {
             final ListenableFuture<TCPNetworkConnection> future =
-                    TCPNetworkConnection.connectTo(params, new InetSocketAddress(addr, params.port), 1000 /* timeout */);
+                    TCPNetworkConnection.connectTo(params, new InetSocketAddress(addr, params.getPort()), 1000 /* timeout */);
             futures.add(future);
             // Once the connection has completed version handshaking ...
             Futures.addCallback(future, new FutureCallback<TCPNetworkConnection>() {
diff --git a/tools/src/main/java/com/google/bitcoin/tools/WalletTool.java b/tools/src/main/java/com/google/bitcoin/tools/WalletTool.java
index 2239d614..488afa3e 100644
--- a/tools/src/main/java/com/google/bitcoin/tools/WalletTool.java
+++ b/tools/src/main/java/com/google/bitcoin/tools/WalletTool.java
@@ -585,7 +585,7 @@ public class WalletTool {
             String[] peerAddrs = peersFlag.split(",");
             for (String peer : peerAddrs) {
                 try {
-                    peers.addAddress(new PeerAddress(InetAddress.getByName(peer), params.port));
+                    peers.addAddress(new PeerAddress(InetAddress.getByName(peer), params.getPort()));
                 } catch (UnknownHostException e) {
                     System.err.println("Could not understand peer domain name/IP address: " + peer + ": " + e.getMessage());
                     System.exit(1);