.aero – for the air transport industry

.biz – for business use

.cat – for Catalan language/culture

.com – for commercial organizations, but unrestricted

.coop – for cooperatives

.edu – for post-secondary educational establishments

.gov – for governments and their agencies in the United States

.info – for informational sites, but unrestricted

.int – for international organizations established by treaty

.jobs – for employment-related sites

.mil – for the US military

.mobi – for sites catering to mobile devices

.museum – for museums

.name – for families and individuals

.net – originally for network infrastructures, now unrestricted

.org – originally for organizations not clearly falling within the other gTLDs, now unrestricted

.pro – for certain professions

.travel – for travel agents, airlines, hoteliers, tourism bureaus, etc.

.asia – for the Asian community

.post – for postal services

.tel – for services involving connections between the telephone network and the Internet

.geo – for geographically related sites