Wordpress sortable column by IP address - php

Question

I have been able to add a sortable column to my Wordpress userpage that displays the users last know IP address.
The problem I seem to be having is getting the column to sort by the IP's numbers and not the usernames alphabetically.
I feel im missing something simple and could use another set of eyes.
<?php
class Register_IP_Multisite {
public function __construct() {
add_action( 'init', array( &$this, 'init' ) );
}
public function init() {
add_action( 'user_register', array( $this,'log_ip') );
add_action( 'edit_user_profile', array( $this,'edit_user_profile') );
add_action( 'manage_users_custom_column', array( $this,'columns'), 10, 3);
add_filter( 'manage_users_sortable_columns', array( $this ,'users_sortable_columns_wsp') );
add_filter( 'request', array( $this ,'users_orderby_column_wsp') );
add_filter( 'plugin_row_meta', array( $this ,'donate_link'), 10, 2 );
if ( is_multisite() ) {
add_filter('wpmu_users_columns', array( $this ,'column_header_signup_ip'));
} else {
add_filter('manage_users_columns', array( $this ,'column_header_signup_ip'));
}
}
public function log_ip($user_id){
$ip = $_SERVER['REMOTE_ADDR']; //Get the IP of the person registering
update_user_meta($user_id, 'signup_ip', $ip); //Add user metadata to the usermeta table
}
public function edit_user_profile() {
$user_id = (int) $_GET['user_id'];
?>
<h3><?php _e('Signup IP Address', 'register-ip-mutisite'); ?></h3>
<p style="text-indent:15px;"><?php
$ip_address = get_user_meta($user_id, 'signup_ip', true);
echo $ip_address;
?></p>
<?php
}
public function column_header_signup_ip($column_headers) {
$column_headers['signup_ip'] = __('IP Address', 'register-ip-multisite');
return $column_headers;
}
public function users_sortable_columns_wsp($column_headers) {
$customwsp = array(
// meta column id => sortby value used in query
'signup_ip' => 'user_ip_address',
);
return wp_parse_args($customwsp, $column_headers);
}
public function users_orderby_column_wsp( $varswsp ) {
if ( isset( $varswsp['orderby'] ) && 'signup_ip' == $varswsp['orderby'] ) {
$varswsp = array_merge( $varswsp, array(
'meta_key' => 'signup_ip',
'orderby' => 'meta_value'
) );
}
return $varswsp;
}
public function columns($value, $column_name, $user_id) {
global $modewsp;
$modewsp = empty( $_REQUEST['mode'] ) ? 'list' : $_REQUEST['mode'];
if ( $column_name == 'signup_ip' ) {
$ip = get_user_meta($user_id, 'signup_ip', true);
if ($ip != ""){
$theip = $ip;
if ( has_filter('ripm_show_ip') ) {
$theip = apply_filters('ripm_show_ip', $theip);
}
return $theip;
} else {
$theip = '<em>'.__('None Recorded', 'register-ip-multisite').'</em>';
return $theip;
}
}
$user_ip_address = strtotime(get_date_from_gmt($user->signup_ip));
return $value;
}
}
new Register_IP_Multisite();