IP address fields

This provides a field for storing an IP address or range.

The shorthand widget allows a user to enter the values in any of the following formats:

• example.com
• 10.10.10.10
• 10.10.10.*
• 10.10.10.0 - 10.10.12.255
• 10.10.10.10-20

The CIDR widget allows CIDR inputs only:

• 10.10.10.10/32

Drupal 7 version
The addresses are stored internally as a long, this allows you to do network computations quickly (e.g. is 10.10.10.10 within the range 10.10.10.0 - 10.10.10.50).

This code will find any user entities that have an IP range which includes the visitors current IP address.

$visitor_addr = ip2long($user->hostname);
$query = new EntityFieldQuery();
$result = $query
    ->entityCondition('entity_type', 'user')
    ->propertyCondition('status', 1)
    ->fieldCondition('field_yourfieldname', 'start', $visitor_addr, '<=', 0)
    ->fieldCondition('field_yourfieldname', 'end', $visitor_addr, '>=', 0)
    ->execute();