A post on X by Damien Symon suggests this: "A new notification has been published extending India's danger zone for a likely missile test in the Bay of Bengal region, now approx. -3,550 km. Date: 15-17 October 2025."
A NOTAM is a notice containing information essential to personnel concerned with flight operations but not known far enough in advance to be publicized by other means. It states the abnormal status of a component of the National Airspace System ( NAS ) -- not the normal status.