WordPress at a glance
action is not described

network_site_new_form action-hook . WP 4.5.0

Fires at the end of the new site form in network admin.

Usage

add_action( 'network_site_new_form', 'action_function_name_9116' );
function action_function_name_9116(){
	// action...
}

Where the hook is called

In file: /wp-admin/network/site-new.php
network_site_new_form
wp-admin/network/site-new.php 262
do_action( 'network_site_new_form' );

Where the hook is used (in WP core)

Does not used.