how to detect the ISP of the visitor thru PHP code

(PECL geoip >= 1.0.2)
geoip_isp_by_name — Get the Internet Service Provider (ISP) name

Description ¶

string geoip_isp_by_name ( string $hostname )
The geoip_isp_by_name() function will return the name of the Internet Service Provider (ISP) that an IP is assigned to.

This function is currently only available to users who have bought a commercial GeoIP ISP Edition. A warning will be issued if the proper database cannot be located.

Parameters ¶

hostname
The hostname or IP address.

Return Values ¶

Returns the ISP name on success, or FALSE if the address cannot be found in the database.

Examples ¶

Example #1 A geoip_isp_by_name() example

This will print the ISP name of host example.com.

<?php
$isp = geoip_isp_by_name('www.example.com');
if ($isp) {
    echo 'This host IP is from ISP: ' . $isp;
}
?>
The above example will output:

This host IP is from ISP: ICANN c/o Internet Assigned Numbers Authority