000999

000999 is a six-digit string that combines two widely known emergency numbers: 000, used in Australia, and 999, used in the United Kingdom and several other countries. As a standalone term, it does not correspond to a single official emergency service or organization. The sequence is sometimes encountered in discussions about cross-border communication, media representations, or as a typographical or puzzle-related reference rather than a real-world dialing code.

In practice, emergency dialing varies by country. In Australia, dialing 000 connects police, fire, or ambulance services to a centralized operator. In the United Kingdom and Ireland, dialing 999 connects to emergency services, with operators directing callers to the appropriate police, fire, or medical responders. Other regions may use different numbers, such as 112, 911, or local equivalents. Because 000 and 999 are distinct systems, concatenating them as 000999 does not create a new service and is not a recognized emergency number in any jurisdiction.

Culturally, the string 000999 occasionally appears in fiction, puzzles, or discussions about emergency preparedness to evoke the concept of urgent or simultaneous contact with multiple services. It may also appear in discussions about international telecommunication and the differences between national emergency numbers. For actual emergencies, callers should use the correct emergency number designated in their country.

See also: 000, 999, emergency numbers, emergency services.