W3cubDocs

/PHP

gethostbyaddr

(PHP 4, PHP 5, PHP 7, PHP 8)

gethostbyaddr — Get the Internet host name corresponding to a given IP address

Description

gethostbyaddr(string $ip): string|false

Returns the host name of the Internet host specified by ip.

Parameters

ip

The host IP address.

Return Values

Returns the host name on success, the unmodified ip on failure, or false on malformed input.

Examples

Example #1 A simple gethostbyaddr() example

<?php
$hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);

echo $hostname;
?>

See Also

  • gethostbyname() - Get the IPv4 address corresponding to a given Internet host name
  • gethostbynamel() - Get a list of IPv4 addresses corresponding to a given Internet host name

© 1997–2025 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.gethostbyaddr.php