Skip to content

Instantly share code, notes, and snippets.

@Ne00n
Forked from tott/ip_in_range.php
Created April 6, 2017 18:58
Show Gist options
  • Save Ne00n/9f7a6e09cc82000e4677b1087e2b7a3b to your computer and use it in GitHub Desktop.
Save Ne00n/9f7a6e09cc82000e4677b1087e2b7a3b to your computer and use it in GitHub Desktop.
php check if IP is in given network range
/**
* Check if a given ip is in a network
* @param string $ip IP to check in IPV4 format eg. 127.0.0.1
* @param string $range IP/CIDR netmask eg. 127.0.0.0/24, also 127.0.0.1 is accepted and /32 assumed
* @return boolean true if the ip is in this range / false if not.
*/
function ip_in_range( $ip, $range ) {
if ( strpos( $range, '/' ) == false ) {
$range .= '/32';
}
// $range is in IP/CIDR format eg 127.0.0.1/24
list( $range, $netmask ) = explode( '/', $range, 2 );
$range_decimal = ip2long( $range );
$ip_decimal = ip2long( $ip );
$wildcard_decimal = pow( 2, ( 32 - $netmask ) ) - 1;
$netmask_decimal = ~ $wildcard_decimal;
return ( ( $ip_decimal & $netmask_decimal ) == ( $range_decimal & $netmask_decimal ) );
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment