IPAddress()

IPAddress(address);

#include <Ethernet.h>
 
// network configuration. dns server, gateway and subnet are optional.
 
byte mac[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };  
 
// the dns server ip
IPAddress dnServer(192, 168, 0, 1);
// the router's gateway address:
IPAddress gateway(192, 168, 0, 1);
// the subnet:
IPAddress subnet(255, 255, 255, 0);
 
// the IP address is dependent on your network
IPAddress ip(192, 168, 0, 2);
 
void setup() {
  Serial.begin(9600);
 
  // initialize the ethernet device
  Ethernet.begin(mac, ip, dnServer, gateway, subnet);
  // print out the IP address
  Serial.print("IP = ");
  Serial.println(Ethernet.localIP());
}
 
void loop() {
}