The Sunsetting IPv4 (sunset4) WG in the Internet Area has concluded. The IESG contact person is Terry Manderson. The mailing list will remain active. The Sunset4 Working Group is being closed as the appetite for sunset4 items in the IETF and in the Internet industry are directly related to the progress of ubiquitous IPv6 adoption. It may be in the future that sunset4 like topics and discussion are again needed, so while the Working Group is being closed the mailing list will remain open as a location for that discussion.