Rabaul Creole German (also called Unserdeutsch, our German) is a creole language spoken in Papua New Guinea, and parts of Australia. It is the only German-based Creole language with an ISO code. It was developed in Papua New Guinea, around 1900. At that time, Papua New Guinea was a German colony. Today, most speakers live in Eastern Australia. Most speakers are old, so the language will soon disappear. Australian speakers of Unserdeutsch now live scattered in cities on the east coast, but communicate with one another in closed groups of social networks. It is estimated that fewer than ten Unserdeutsch speakers live in Papua New Guinea today. All speakers of Unserdeutsch know at least two other languages. In most cases, these are English and Tok Pisin. Estimates are that there are about 100 speakers left.