gistfile1.php

<?php

$startIP = [1, 1, 1, 50];
$numToGenerate = 255;

// Convert the array into the binary representation
$startIP = array_map(function($num) {
	return str_pad(decbin($num), 8, "0", STR_PAD_LEFT);
}, $startIP);
$startIP = implode('', $startIP); // Should be 32 bits represented as binary here (in a string)

// Generate the IPs
$startIPDec = bindec($startIP);
$results = [];
for ($i = 0; $i < $numToGenerate; $i++) {
	// Save each IP as the 32 bit binary string
	$results[] = str_pad(decbin($startIPDec + $i), 32, "0", STR_PAD_LEFT);
}

// Output
foreach ($results as $result) {
	echo implode('.', array_map('bindec', str_split($result, 8)));
	echo '<br>';
}