diff --git a/libraries/Ethernet/Udp.cpp b/libraries/Ethernet/Udp.cpp
index 17eaac69c..b349317d7 100644
--- a/libraries/Ethernet/Udp.cpp
+++ b/libraries/Ethernet/Udp.cpp
@@ -32,10 +32,25 @@
 #include "Udp.h"
 
 /* Start UDP socket, listening at local port PORT */
-void UdpClass::begin(uint16_t port) {
+uint8_t UdpClass::begin(uint16_t port) {
+  if (_sock != MAX_SOCK_NUM)
+    return 0;
+
+  for (int i = 0; i < MAX_SOCK_NUM; i++) {
+    uint8_t s = W5100.readSnSR(i);
+    if (s == SnSR::CLOSED || s == SnSR::FIN_WAIT) {
+      _sock = i;
+      break;
+    }
+  }
+
+  if (_sock == MAX_SOCK_NUM)
+    return 0;
+
   _port = port;
-  _sock = 0; //TODO: should not be hardcoded
   socket(_sock, SnMR::UDP, _port, 0);
+
+  return 1;
 }
 
 /* Send packet contained in buf of length len to peer at specified ip, and port */
@@ -129,8 +144,15 @@ port = myPort;
 return ret;
 }
 
+/* Release any resources being used by this UdpClass instance */
+void UdpClass::stop()
+{
+  if (_sock == MAX_SOCK_NUM)
+    return;
 
+  close(_sock);
 
+  EthernetClass::_server_port[_sock] = 0;
+  _sock = MAX_SOCK_NUM;
+}
 
-/* Create one global object */
-UdpClass Udp;
diff --git a/libraries/Ethernet/Udp.h b/libraries/Ethernet/Udp.h
index 5b88d3e06..51c045f20 100644
--- a/libraries/Ethernet/Udp.h
+++ b/libraries/Ethernet/Udp.h
@@ -45,7 +45,8 @@ private:
   uint16_t _port; // local port to listen on
 
 public:
-  void begin(uint16_t);				// initialize, start listening on specified port
+  UdpClass() : _sock(MAX_SOCK_NUM) {};
+  uint8_t begin(uint16_t);	// initialize, start listening on specified port. Returns 1 if successful, 0 if there are no sockets available to use
   int available();								// has data been received?
 
   // C-style buffer-oriented functions
@@ -56,8 +57,8 @@ public:
   // readPacket that fills a character string buffer
   int readPacket(char *, uint16_t, uint8_t *, uint16_t &);
 
+  // Finish with the UDP socket
+  void stop();
 };
 
-extern UdpClass Udp;
-
 #endif
diff --git a/libraries/Ethernet/examples/UDPSendReceiveString/UDPSendReceiveString.pde b/libraries/Ethernet/examples/UDPSendReceiveString/UDPSendReceiveString.pde
index cfe1b58b5..6f694d250 100644
--- a/libraries/Ethernet/examples/UDPSendReceiveString/UDPSendReceiveString.pde
+++ b/libraries/Ethernet/examples/UDPSendReceiveString/UDPSendReceiveString.pde
@@ -35,6 +35,8 @@ unsigned int remotePort; // holds received packet's originating port
 char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; //buffer to hold incoming packet,
 char  ReplyBuffer[] = "acknowledged";       // a string to send back
 
+// A UDP instance to let us send and receive packets over UDP
+UdpClass Udp;
 
 void setup() {
   // start the Ethernet and UDP:
diff --git a/libraries/Ethernet/examples/UdpNtpClient/UdpNtpClient.pde b/libraries/Ethernet/examples/UdpNtpClient/UdpNtpClient.pde
index 0b3832b5b..c28e1e02e 100644
--- a/libraries/Ethernet/examples/UdpNtpClient/UdpNtpClient.pde
+++ b/libraries/Ethernet/examples/UdpNtpClient/UdpNtpClient.pde
@@ -37,6 +37,9 @@ const int NTP_PACKET_SIZE= 48; // NTP time stamp is in the first 48 bytes of the
 
 byte packetBuffer[ NTP_PACKET_SIZE]; //buffer to hold incoming and outgoing packets 
 
+// A UDP instance to let us send and receive packets over UDP
+UdpClass Udp;
+
 void setup() 
 {
   // start Ethernet and UDP
@@ -80,8 +83,16 @@ void loop()
     Serial.print("The UTC time is ");       // UTC is the time at Greenwich Meridian (GMT)
     Serial.print((epoch  % 86400L) / 3600); // print the hour (86400 equals secs per day)
     Serial.print(':');  
+    if ( ((epoch % 3600) / 60) < 10 ) {
+      // In the first 10 minutes of each hour, we'll want a leading '0'
+      Serial.print('0');
+    }
     Serial.print((epoch  % 3600) / 60); // print the minute (3600 equals secs per minute)
     Serial.print(':'); 
+    if ( (epoch % 60) < 10 ) {
+      // In the first 10 seconds of each minute, we'll want a leading '0'
+      Serial.print('0');
+    }
     Serial.println(epoch %60); // print the second
   }
   // wait ten seconds before asking for the time again