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gethostbyname — Gets the IP address for an Internet host.


string gethostbyname(hostname);
string hostname: Internet hostname


IP address; the hostname argument on error


gethostbyname() performs a DNS lookup of an Internet hostname and returns the corresponding IP address. If no IP address can be found for the specified hostname, the function returns the hostname argument.


PHP Version: 3+, 4+


Example 835. Find the IP address for a hostname

$host = '';
$ip = gethostbyname ($host);

if ($ip != $host)
    echo "The IP address for <i>$host</i> is <i>$ip</i>.";
    echo "I could not successfully look up <i>$host</i>.";

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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