Security

Check IP address matches or is in range

Type:	code fragment
Added by:	studio24
Entered:	02/07/2003
Last modified:	07/12/2002
Rating:	- (fewer than 3 votes)
Views:	9786

If you need to check if the current user's IP address is either within a set range or matches a given IP use this function. Possible uses include additional security for an authentication script. IP range needs to be in form 12.34.56.78-12.34.67.89

<?php

                             function checkIPorRange ($ip_address) {

                                if (ereg("-",$ip_address)) {  

                                    // Range

                                    $ar = explode("-",$ip_address);

                                    $your_long_ip = ip2long($_SERVER["REMOTE_ADDR"]);

                                    if ( ($your_long_ip >= ip2long($ar[0])) && ($your_long_ip <= ip2long($ar[1])) ) {

                                        return TRUE;

                                    }

                                } else {

                                    // Single IP

                                    if ($_SERVER["REMOTE_ADDR"] == $ip_address) {

                                        return TRUE;

                                    }

                                }

                                return FALSE;

                            }
?>

Usage Example

$ip_range = "198.152.0.0-198.152.4.0";

                            

                            if (checkIPorRange($ip_range)) {

                                print "IP OK";

                            }

                            If your IP was 198.152.1.32

                            The above would return: IP OK

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