| Network and Academic Computing Services | Academic & Science |
| Network Academic Computing Services | Academic & Science |
| Neutral Atmosphere Composition Spectrometer | Academic & Science |
| North American Catalysis Society | Academic & Science |
| North American Consulting School | Business |
| National Association Credit Services | Business |
| National Association of Convenience Stores | Business |
| National Association of College Stores | Business |
| Nordic Association for China Studies | Business |
| Native American Community Services | Community |
| North Actors Club Special | Community |
| National Association of Credit Specialists | Community |
| National Association of Cambodian Scouts | Community |
| National Association of Chimney Sweeps | Community |
| North American Catalan Society | Community |
| North American Community Service | Community |
| Northwest Aquatic Club Swimming | Community |
| National Association of Consumer Shows | Community |
| Northwest Allen County Schools | Community |
| National Association of County Surveyors | Community |
| Nashville Academy of Computer Science | Computing |
| Netware Asynchronous Communications Server | Computing |
| Novell Asynchronous Communications Server | Computing |
| Network Asynchronous Communications Services | Computing |
| Northwest Acute Care Specialists | General |
| Neuroscience and Cognitive ScienceDo | General |
| Neuroscience and Cognitive ScienceWhat | General |
| North American Challenge Skate | General |
| Nutrition Assessment Counseling and Support | General |
| Non Action Centered Subsystem | General |
| National Administrative Codes Service | Governmental |
| National Anti-Corruption Strategy | Governmental |
| Neighborhood Alliance for Child Safety | Governmental |
| Notifications and Clinical Summaries | Medical |
| Neuroscience and Cognitive Science | Medical |
| Netware Asynchronous Communication Services | Networking |
| Nushi Advanced Chat Server | Softwares |
| North American Cycle Sport | Sports |