The country code top level domain (ccTLD) .AO is assigned to Angola. The TLD is restricted for use. There are requirements for a connection to the country itself and is available for use only in Angola residents.
There are no officially configured second-level subdomains but some common ones do appear like .gov.AO.
The .AO ccTLD has been activated by University of Agostinho Neto, the sponsor and registrar. The ccTLD has been available since 1995. The Internet and the ccTLD is available and not very popular either inside or outside the country.
Iron Noder 2017