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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 37.61.233.58

$hostname = gethostbyaddr(37.61.233.58);

hostname for IP address 37.61.233.58 is web1uk.onlinesales.co.uk

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

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