diff --git a/transport-udt/src/main/java/io/netty/channel/udt/DefaultUdtChannelConfig.java b/transport-udt/src/main/java/io/netty/channel/udt/DefaultUdtChannelConfig.java
index 06e69c3e2d..ae90addda3 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/DefaultUdtChannelConfig.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/DefaultUdtChannelConfig.java
@@ -31,7 +31,10 @@ import static io.netty.channel.udt.UdtChannelOption.*;
 
 /**
  * The default {@link UdtChannelConfig} implementation.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public class DefaultUdtChannelConfig extends DefaultChannelConfig implements
         UdtChannelConfig {
 
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/DefaultUdtServerChannelConfig.java b/transport-udt/src/main/java/io/netty/channel/udt/DefaultUdtServerChannelConfig.java
index 9f6c07cc97..9c40b1234c 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/DefaultUdtServerChannelConfig.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/DefaultUdtServerChannelConfig.java
@@ -28,7 +28,10 @@ import static io.netty.channel.ChannelOption.*;
 
 /**
  * The default {@link UdtServerChannelConfig} implementation.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public class DefaultUdtServerChannelConfig extends DefaultUdtChannelConfig
         implements UdtServerChannelConfig {
 
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/UdtChannel.java b/transport-udt/src/main/java/io/netty/channel/udt/UdtChannel.java
index 2e2b412564..c0ffe69038 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/UdtChannel.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/UdtChannel.java
@@ -24,7 +24,10 @@ import java.net.InetSocketAddress;
  * UDT {@link Channel}.
  * <p>
  * Supported UDT {@link UdtChannel} are available via {@link NioUdtProvider}.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public interface UdtChannel extends Channel {
 
     /**
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/UdtChannelConfig.java b/transport-udt/src/main/java/io/netty/channel/udt/UdtChannelConfig.java
index 99acf4ad67..48866dc650 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/UdtChannelConfig.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/UdtChannelConfig.java
@@ -69,7 +69,10 @@ import io.netty.channel.RecvByteBufAllocator;
  * {@code "receiveBufferSize"} and {@code "sendBufferSize"} as maximum message
  * size. If received or sent message does not fit specified sizes,
  * {@link ChannelException} will be thrown.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public interface UdtChannelConfig extends ChannelConfig {
 
     /**
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/UdtChannelOption.java b/transport-udt/src/main/java/io/netty/channel/udt/UdtChannelOption.java
index 71d02296b0..c489f90ca4 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/UdtChannelOption.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/UdtChannelOption.java
@@ -20,7 +20,10 @@ import io.netty.channel.ChannelOption;
 
 /**
  * Options for the UDT transport
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public final class UdtChannelOption<T> extends ChannelOption<T> {
 
     /**
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/UdtMessage.java b/transport-udt/src/main/java/io/netty/channel/udt/UdtMessage.java
index 29de50f286..4eca4e0998 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/UdtMessage.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/UdtMessage.java
@@ -24,7 +24,10 @@ import io.netty.channel.udt.nio.NioUdtProvider;
  * The message container that is used for {@link TypeUDT#DATAGRAM} messages.
  * @see NioUdtProvider#MESSAGE_CONNECTOR
  * @see NioUdtProvider#MESSAGE_RENDEZVOUS
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public final class UdtMessage extends DefaultByteBufHolder {
 
     public UdtMessage(final ByteBuf data) {
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/UdtServerChannel.java b/transport-udt/src/main/java/io/netty/channel/udt/UdtServerChannel.java
index a04d195122..0575a4867a 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/UdtServerChannel.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/UdtServerChannel.java
@@ -22,7 +22,10 @@ import io.netty.channel.udt.nio.NioUdtProvider;
  * UDT {@link ServerChannel}.
  * <p>
  * Supported UDT {@link UdtServerChannel} are available via {@link NioUdtProvider}.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public interface UdtServerChannel extends ServerChannel, UdtChannel {
 
 }
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/UdtServerChannelConfig.java b/transport-udt/src/main/java/io/netty/channel/udt/UdtServerChannelConfig.java
index 541ba12694..f2409d3944 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/UdtServerChannelConfig.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/UdtServerChannelConfig.java
@@ -31,7 +31,10 @@ import io.netty.channel.RecvByteBufAllocator;
  * {@code "receiveBufferSize"} and {@code "sendBufferSize"} as maximum message
  * size. If received or sent message does not fit specified sizes,
  * {@link ChannelException} will be thrown.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public interface UdtServerChannelConfig extends UdtChannelConfig {
 
     /**
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtAcceptorChannel.java b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtAcceptorChannel.java
index 9c7f130bcb..ba1f7ac9d6 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtAcceptorChannel.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtAcceptorChannel.java
@@ -38,7 +38,10 @@ import static java.nio.channels.SelectionKey.*;
 
 /**
  * Common base for Netty Byte/Message UDT Stream/Datagram acceptors.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public abstract class NioUdtAcceptorChannel extends AbstractNioMessageChannel implements UdtServerChannel {
 
     protected static final InternalLogger logger =
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteAcceptorChannel.java b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteAcceptorChannel.java
index 882ee89132..fde1400828 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteAcceptorChannel.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteAcceptorChannel.java
@@ -21,7 +21,10 @@ import io.netty.channel.udt.UdtChannel;
 
 /**
  * Byte Channel Acceptor for UDT Streams.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public class NioUdtByteAcceptorChannel extends NioUdtAcceptorChannel {
 
     public NioUdtByteAcceptorChannel() {
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteConnectorChannel.java b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteConnectorChannel.java
index 9c81d30912..fa4f8ab5bb 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteConnectorChannel.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteConnectorChannel.java
@@ -41,7 +41,10 @@ import static java.nio.channels.SelectionKey.*;
 
 /**
  * Byte Channel Connector for UDT Streams.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public class NioUdtByteConnectorChannel extends AbstractNioByteChannel implements UdtChannel {
 
     private static final InternalLogger logger =
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteRendezvousChannel.java b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteRendezvousChannel.java
index d0647dd9d3..90446612b4 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteRendezvousChannel.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtByteRendezvousChannel.java
@@ -19,7 +19,10 @@ import com.barchart.udt.TypeUDT;
 
 /**
  * Byte Channel Rendezvous for UDT Streams.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public class NioUdtByteRendezvousChannel extends NioUdtByteConnectorChannel {
 
     public NioUdtByteRendezvousChannel() {
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageAcceptorChannel.java b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageAcceptorChannel.java
index 4d8f7d0689..dcf971fc96 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageAcceptorChannel.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageAcceptorChannel.java
@@ -21,7 +21,10 @@ import io.netty.channel.udt.UdtChannel;
 
 /**
  * Message Channel Acceptor for UDT Datagrams.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public class NioUdtMessageAcceptorChannel extends NioUdtAcceptorChannel {
 
     public NioUdtMessageAcceptorChannel() {
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageConnectorChannel.java b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageConnectorChannel.java
index 28411c9f94..2e4a319f33 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageConnectorChannel.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageConnectorChannel.java
@@ -42,7 +42,10 @@ import static java.nio.channels.SelectionKey.*;
  * Message Connector for UDT Datagrams.
  * <p>
  * Note: send/receive must use {@link UdtMessage} in the pipeline
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public class NioUdtMessageConnectorChannel extends AbstractNioMessageChannel implements UdtChannel {
 
     private static final InternalLogger logger =
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageRendezvousChannel.java b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageRendezvousChannel.java
index b16e119b9f..370630bce6 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageRendezvousChannel.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtMessageRendezvousChannel.java
@@ -22,7 +22,10 @@ import io.netty.channel.udt.UdtMessage;
  * Message Rendezvous for UDT Datagrams.
  * <p>
  * Note: send/receive must use {@link UdtMessage} in the pipeline
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public class NioUdtMessageRendezvousChannel extends
         NioUdtMessageConnectorChannel {
 
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtProvider.java b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtProvider.java
index a52438f8f6..dd0b6ba3b8 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtProvider.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/nio/NioUdtProvider.java
@@ -38,7 +38,10 @@ import java.nio.channels.spi.SelectorProvider;
  * Provides {@link ChannelFactory} for UDT channels.
  * <p>
  * Provides {@link SelectorProvider} for UDT channels.
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 public final class NioUdtProvider<T extends UdtChannel> implements ChannelFactory<T> {
 
     /**
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/nio/package-info.java b/transport-udt/src/main/java/io/netty/channel/udt/nio/package-info.java
index ca4a707be4..ded21fdf88 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/nio/package-info.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/nio/package-info.java
@@ -17,6 +17,9 @@
  * UDT Transport for NIO Channels.
  * <p>
  * @see io.netty.example.udt
+ *
+ * @deprecated The UDT transport is no longer maintained.
  */
+@Deprecated
 package io.netty.channel.udt.nio;
 
diff --git a/transport-udt/src/main/java/io/netty/channel/udt/package-info.java b/transport-udt/src/main/java/io/netty/channel/udt/package-info.java
index 2080de1684..6402aefa4e 100644
--- a/transport-udt/src/main/java/io/netty/channel/udt/package-info.java
+++ b/transport-udt/src/main/java/io/netty/channel/udt/package-info.java
@@ -17,6 +17,9 @@
  * UDT Transport.
  * <p>
  * @see io.netty.example.udt
+ *
+ * @deprecated The UDT transport is no longer maintained and will be removed.
  */
+@Deprecated
 package io.netty.channel.udt;