| American Nicaraguan School | Academic & Science |
| Amman National School | Academic & Science |
| Aquatic Nuisance Species | Academic & Science |
| Advances in Nursing Science | Academic & Science |
| American Numismatic Society | Academic & Science |
| Audubon Naturalist Society | Academic & Science |
| Astronomical Netherlands Satellite | Academic & Science |
| Australian Neuroscience Society | Academic & Science |
| American Neuromodulation Society | Academic & Science |
| Andahuaylas | Airport Code |
| Ansvarlig Selskap | Business |
| Advanced Network and Services | Business |
| Airnet Systems, Inc. | Business |
| American Nuclear Society | Business |
| Ainsworth Lumber Company, LTD. | Business |
| 1-anilino-8-naftalen-sulfonat | Chemistry |
| Azerbaijani News Service | Community |
| ASSIST News Service | Community |
| Answer Tone | Computer and Networking |
| Advanced Networking Software | Computing |
| Answer Message | Computing |
| Application Networking Services | Computing |
| Automatic Network Shutdown | Computing |
| Access Nodes | Computing |
| Authoritative Name Server | Computing |
| Advanced Network Services | Computing |
| Agent Name Server | Computing |
| ANS Crypto Coin | Cryptocurrency |
| Animation (graphics Or Text) | File Type |
| Ascii Text with Ansi Character Set | File Type |
| Always Needs Service | General |
| Armored Nanoroid Slave | General |
| Applied NanoStructured Solutions | General |
| Alexander Nikolayevich Scriabin | General |
| Advanced Networking Services | General |
| Allied Network Solutions | General |
| Adjusted Net Savings | General |
| Ambient Noise Sensor | General |
| Northeastern Section | General |
| Arizona Nutritional Supplements | General |
| American National Standard | General |
| Anti Noise System | General |
| Assistance Non Stop | General |
| Active Noise System | General |
| Autonomous Navigation System | General |
| NAS Transition Implementation Service | Governmental |
| Army Network Station | Governmental |
| American National Standards | Governmental |
| Arise and Shine | Internet |
| Adrenergic Nervous System | Medical |
| Autonomic Nervous System | Medical |
| Ataxia Neuropathy Spectrum | Medical |
| American Neurotology Society | Medical |
| Apple Network Server | Networking |
| Algemeen Nijmeegs Studentenblad | News & Entertainment |
| Andahuaylas, Peru | Regional |
| Anna Nicole Smith | Society & Culture |
| Andahuaylas Airport | Transport & Travel |
