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WiFi101
WiFi.macAddress()
Description
Gets the MAC Address of your WiFi shield 
Syntax
WiFi.macAddress(mac); 
Parameters
mac: a 6 byte array to hold the MAC address
Returns
byte array : 6 bytes representing the MAC address of your shield
Example
  #include <SPI.h>
#include <WiFi101.h>
char ssid[] = "yourNetwork";     // the name of your network
int status = WL_IDLE_STATUS;     // the Wifi radio's status
byte mac[6];                     // the MAC address of your Wifi shield
void setup()
{
 Serial.begin(9600);
 status = WiFi.begin(ssid);
 if ( status != WL_CONNECTED) { 
    Serial.println("Couldn't get a wifi connection");
    while(true);
  } 
  // if you are connected, print your MAC address:
  else {
  WiFi.macAddress(mac);
  Serial.print("MAC: ");
  Serial.print(mac[5],HEX);
  Serial.print(":");
  Serial.print(mac[4],HEX);
  Serial.print(":");
  Serial.print(mac[3],HEX);
  Serial.print(":");
  Serial.print(mac[2],HEX);
  Serial.print(":");
  Serial.print(mac[1],HEX);
  Serial.print(":");
  Serial.println(mac[0],HEX);
  }
}
void loop () {}
 
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