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Reference > Libraries > Ethernet > Ethernet.setsubnetmask

Ethernet - Ethernet.setSubnetMask()

Description

Set the subnet mask of the network. Not for use with DHCP.

Syntax

Ethernet.setSubnetMask(subnet)

Parameters

  • subnet: the subnet mask of the network (IPAddress)

Returns

Nothing

Example

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(10, 0, 0, 177);
IPAddress myDns(192, 168, 1, 1);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 0, 0);

void setup() {
  Ethernet.begin(mac, ip, myDns, gateway, subnet);
  IPAddress newSubnet(255, 255, 255, 0);
  Ethernet.setSubnetMask(newSubnet);  // change the subnet mask
}

void loop () {}