Whitelist all IP/ Ray Dehler method does not work any longer

You can try below code

var startingPoint = 0; 
var endpoint = 0; 

openPage(); 
function openPage() 
{ 
endpoint = startingPoint + 1; 
var win = window.open('https://ap2.salesforce.com/05G/e?IpStartAddress=' + startingPoint + '.0.0.0&IpEndAddress=' + endpoint + '.255.255.255&isdtp=vw',600,600); 
win.onload = function() 
{ 
win.document.getElementsByName('save')[0].click();
win.onunload = function() 
{ 
win.close(); 
startingPoint = startingPoint + 2; 
if(startingPoint <= 255) 
{ 
openPage(); 
} 
} 
} 
}

Special thanks to MVP Ankit Arora (Reference:)