Whenever in a case under this title notice is to be given to creditors generally or to any class or category of creditors, such notice shall also be given to the known creditors generally, or to creditors in the notified class or category, that do not have addresses in the United States. The court may order that appropriate steps be taken with a view to notifying any creditor whose address is not yet known.

Such notification to creditors with foreign addresses described in subsection (a) shall be given individually, unless the court considers that, under the circumstances, some other form of notification would be more appropriate. No letter or other formality is required.

Any rule of procedure or order of the court as to notice or the filing of a proof of claim shall provide such additional time to creditors with foreign addresses as is reasonable under the circumstances.