hide_commenter_email_and_ip.php

//hide commenters email and IP from non admins
function filter_comment_email( $email ) { return ''; } // you can return 'private' or something if you want
function filter_comment_author_IP( $ip ) { return ''; }

if (!current_user_can('administrator')) {
	add_filter( 'comment_email', 'filter_comment_email' );
	add_filter( 'get_comment_author_IP', 'filter_comment_author_IP' );
}