# gethostbyaddr

(PHP 4, PHP 5)

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

### Description

string gethostbyaddr ( string `$ip_address` )

Returns the host name of the Internet host specified by `ip_address` .

### Parameters

`ip_address`

  The host IP address.

### Return Values

Returns the host name or the unmodified `ip_address` on failure.

### Examples

Example#1 A simple gethostbyaddr() example

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

### See Also

- gethostbyname()
- gethostbynamel()