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@ 2019-08-07T21:43:22Z

<?php

function ipsBetween($from, $to)
{
    return ip2long($to) - ip2long($from);    
}

echo ipsBetween("10.0.0.0", "10.0.0.50") . PHP_EOL;
echo ipsBetween("10.0.0.0", "10.0.1.0") . PHP_EOL;
echo ipsBetween("20.0.0.10", "20.0.1.0");

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Output for 7.1.25 - 7.1.31, 7.2.0 - 7.2.33, 7.3.0 - 7.3.26, 7.4.0 - 7.4.14, 8.0.0 - 8.0.2: 50 256 246