The domain names .ngo and ong is generic top-level domains(gTLD) of the Domain Name System(DNS) used on the Internet, sponsored and managed by the Public Internet Registry. The backend is provided by Afilias.
Registration for this domain is open to anyone. The registry accepts registrations of internationalized domain names.
Note that .NGO and .ONG are two separate domains that must be registered together. However, they are sold as a bundle and the second registration is free of charge.