per the title you guys, can someone explain to me why PHP returns so many different variants when throwing out visitor info using this piece of code?
$ip = gethostbyaddr($_SERVER['REMOTE_ADDR']);
here are some examples I have seen recently:
planetlab24.gino-research.net.in.tum.de 10.32.64.124 188.8.131.52.bc.googleusercontent.com abts-north-dynamic-184.108.40.206.airtelbroadband.in 173-20-152-84.client.mchsi.com
now, obviously i can understand the google one, and a few others. but, given the info and insight on these pages: https://www.php.net/manual/en/function.gethostbyaddr.php , and https://www.php.net/reserved.variables.server , why are the returns so different for different people? why does PHP see all different kinds of things? is the cause the way the user’s server is configured? some identifying info OF the server? and what about reserved IPs? like the “10.xx…” one I listed above? I’ve seen hundreds from that pool, and other blocks of reserved ones, and they have never had alpha-chars included in their captures. it’s always only the IP numbers. there a reason for that? really, all I’m looking for is why I see what I see. anyone help? furthermore, does anyone know if other server-side languages like c#, python, ruby or any js frameworks return different results than PHP ever would? thanks.