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gethostbyname & gethostbyaddr

Given a hostname on a shared server the gethostbyaddr will obviously return the 'master' hostname. Here I pass gethostbyname('www.corx.net'), and then the returned IP address to gethostbyaddr.

$ip = gethostbyname('www.corx.net');

IP address for www.corx.net is 91.195.240.123

$hostname = gethostbyaddr(91.195.240.123);

hostname for IP address 91.195.240.123 is 91.195.240.123

See also PHP checkdnsrr and PHP gethostbyname & gethostbyaddr - Googlebot check.

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