(PECL geoip >= 1.0.2)
geoip_isp_by_name — Get the Internet Service Provider (ISP) name
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.
The hostname or IP address.
Returns the ISP name on success, or FALSE if the address cannot be found in the database.
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;
}
?>
上例将输出：
This host IP is allocated to: ICANN c/o Internet Assigned Numbers Authority