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How can I resolve an IP address to a hostname using PHP?
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Click the Windows Start button, then "All Programs" and "Accessories." Right-click on "Command Prompt" and choose "Run as Administrator." Type "nslookup %ipaddress%" in the black box that appears on the screen, substituting %ipaddress% with the IP address for which you want to find the hostname.
To do this in Chrome, simply open up the DevTools, navigate to the Network tab and select the site's HTML doc. You should then see the IP address associated with that URL under Headers > General > Remote Address.
The simplest way to collect the visitor IP address in PHP is the REMOTE_ADDR. Pass the 'REMOTE_ADDR' in PHP $_SERVER variable. It will return the IP address of the visitor who is currently viewing the webpage.
You can use the gethostbyaddr() function.
$hostname = gethostbyaddr($ipAddress);
Use gethostbyaddr()
$hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);
echo $hostname;
You might find that this function can hang for some time when an address is not found - if this becomes a performance issue for you, check this manual comment which details a hand-coded method which supports a timeout.
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