| 6401 | NUM | Nomad Aviation AG | Callsign: Bully, ICAO Callsign changed to Nomadjet. | CH | AVCODES |
| 6402 | NUM | Nomad Aviation AG | Callsign: Nomadjet, ICAO Callsign changed from Bully. | CH | AVCODES |
| 6403 | NUMA | Numajiri Railway | | J | TRAFFIC |
| 6404 | NUMC | NAUPACTUS MARINE CO LTD CYPRUS | | | SCAC3 |
| 6405 | NUMC | NAUPACTUS MARINE CO LTD | | | SCAC4 |
| 6406 | NUMD | NUMED INC | | | SCAC4 |
| 6407 | NUMI | NAUMANN TRANSFER MOVING & STORAGE C | | | SCAC3 |
| 6408 | NUMK | NUMARK TRANSPORTATION | | | SCAC4 |
| 6409 | NUMQ | NU-MINE COAL CO INC | | | SCAC3 |
| 6410 | NUN | Nunasi-Central Airlines Ltd. | Callsign: Nunsai, | CDN | AVCODES |
| 6411 | NUN | Nunasi-Central Airlines Ltd. | IATA: 6N, Callsign: Nunsai, Designator 6N recalled by IATA | CDN | AVCODES |
| 6412 | NUN | Nunasi-Central Airlines | | | ICAO1 |
| 6413 | NUNA | NUNEZ ALVAREZ, FRANCISCO | | | SCAC4 |
| 6414 | NUNE | NUNN'S EXPRESS | | | SCAC4 |
| 6415 | NUNH | NUNN, HOWARD INC | | | SCAC3 |
| 6416 | NUNI | NUNES TRANSPORT INC | | | SCAC3 |
| 6417 | NUNL | NUNLEY, H L TRUCKING CO | | | SCAC3 |
| 6418 | NUNN | NUNN, CLAYTON | | | SCAC3 |
| 6419 | NUNN | NUNEZ ANDRADE, RICARDO | | | SCAC4 |
| 6420 | NUNV | NUNTIUS INVESTMENT CORP | | | SCAC4 |
| 6421 | NUOC | NUMBER ONE CAB CO | | | SCAC3 |
| 6422 | NUR | Avia-Nur | Callsign: Avia Nur, | KZ | AVCODES |
| 6423 | NUR | Nawrs Air | | LAR | AVCODES |
| 6424 | NUR | NATCHEZ, URANIA & RUSTON RAILWAY | | | PWRC |
| 6425 | NURS | NURSERY TRANSPORTATION SERVICE INC | | | SCAC3 |
| 6426 | NUS | Northern Illinois Flight Center, Inc | Callsign: Enjet, | USA | AVCODES |
| 6427 | NUSA | NUGENT SAND COMPANY INC, THE | | | SCAC4 |
| 6428 | NUSB | NUSSBERGER BROS TRUCKING CO | | | SCAC3 |
| 6429 | NUSB | NUSSEY, CHAN TRUCKING | | | SCAC4 |
| 6430 | NUSI | NATIONAL UNDERGROUND STORAGE INC | | | SCAC3 |
| 6431 | NUSM | NUSSEY, MARVYN FARMS INC | | | SCAC4 |
| 6432 | NUSN | NUSS INC | | | SCAC4 |
| 6433 | NUSO | NUSSER OIL CO | | | SCAC4 |
| 6434 | NUSP | NUSTAR TRANSPORT INC | | | SCAC4 |
| 6435 | NUSS | NUSS TIMBER CO INC | | | SCAC3 |
| 6436 | NUST | NUSSBAUM TRUCKING, INC | | | SCAC3 |
| 6437 | NUST | NUSSBAUM TRUCKING INC | | | SCAC4 |
| 6438 | NUSU | NEPTUNE ORIENT LINES, LTD. | | | PWRC |
| 6439 | NUSU | Neptune Orient Lines | | | RSRV |
| 6440 | NUSU | NEPTUNE ORIENT LINES, LTD. | | | SCAC3 |
| 6441 | NUSU | APL CO PTE LTD-NOL GROUP | | | SCAC4 |
| 6442 | NUSY | NUSSEY CARTAGE LIMITED | | | SCAC3 |
| 6443 | NUSY | NUSSEY CARTAGE LIMITED | | | SCAC4 |
| 6444 | NUSZ | NUCOR STEEL | | | PWRC |
| 6445 | NUTA | NAUTAS SA DE C V MEXICO CITY MEX | | | SCAC3 |
| 6446 | NUTB | NUTMEG BAKER SUPPLY CO, THE | | | SCAC3 |
| 6447 | NUTC | NUNZIATO TRUCKING CO | | | SCAC3 |
| 6448 | NUTF | NU-TRAFFIC INC | | | SCAC3 |
| 6449 | NUTI | NU TREND TRANSPORTATION INC | | | SCAC3 |
| 6450 | NUTI | NU TREND TRANSPORTATION INC | | | SCAC4 |
| 6451 | NUTL | NU TREND LINES INC | | | SCAC3 |
| 6452 | NUTR | NUTRI CAILLE LTEE | | | SCAC4 |
| 6453 | NUTT | NUTT TRUCKING INC | | | SCAC3 |
| 6454 | NUVC | NUVAC | | | SCAC4 |
| 6455 | NUVE | NUEVA ESPERANZA CORPORLATION | | | SCAC3 |
| 6456 | NUVF | NUEVA FORTUNA CORPORATION | | | SCAC3 |
| 6457 | NUVG | NUEVA GLORIA CORPORATION | | | SCAC3 |
| 6458 | NUVT | NUSSBAUM TRANSPORTATION SERVICES IN | | | SCAC4 |
| 6459 | NUWA | NU-WAY INC | | | SCAC3 |
| 6460 | NUWA | NU-WAY INC | | | SCAC4 |
| 6461 | NUWB | NIEUWBOER TRUCKING | | | SCAC3 |
| 6462 | NUWF | NU-WAY FUEL DISTRIBUTORS | | | SCAC4 |
| 6463 | NUWJ | NU-WAY TRANSPORT INC | | | SCAC3 |
| 6464 | NUWK | NUWAY TRUCKING INC | | | SCAC3 |
| 6465 | NUWR | NEU WAY TRANSPORT 1985 INC | | | SCAC3 |
| 6466 | NUWS | NU-WAY REPAIR CO | | | SCAC3 |
| 6467 | NUWT | NU-WAY TRANSPORTATION SERVICES INC | | | SCAC4 |
| 6468 | NUWY | NU-WAY EXPRESS AND VAN CO, INC | | | SCAC3 |
| 6469 | NUWY | NUWAY COOPERATIVE | | | SCAC4 |
| 6470 | NUZI | NUZZI BROS TRANS & STORAGE INC | | | SCAC3 |
| 6471 | NUZI | NUZZI FUEL CO LLC | | | SCAC4 |
| 6472 | NV | Iranian Naft Airlines | ICAO: IRG, Callsign: Naft, Name changed to Karun Airlines in September 2017. | IR | AVCODES |
| 6473 | NV | Nakanihon Airlines Co. Ltd. | Name changed to Air Central Co., Ltd. | J | AVCODES |
| 6474 | NV | NTW Air | ICAO: NWT, Callsign: Territorial, Name changed to NWT Air. Air Canada Connector | CDN | AVCODES |
| 6475 | NV | Northern Executive Aviation Ltd. | ICAO: NEX, Callsign: Neatex, Designator NV recalled by IATA | GB | AVCODES |
| 6476 | NV | NWT Air | ICAO: NWT, Callsign: Territorial, Designator NV recalled by IATA. Name changed from NTW Air / Air Canada Connector | CDN | AVCODES |
| 6477 | NV | Air Central Co., Ltd. | Designator NV reinstated by IATA. Name changed from Nakanihon Airlines Co. Ltd | J | AVCODES |
| 6478 | NV | Air Central Co., Ltd. | ICAO: CRF, Callsign: Air Central, Founded on 12 May 1988. Ceased operations on 01 October 2010. | J | AVCODES |
| 6479 | NV | Karun Airlines | ICAO: KRU, Callsign: Karun, IATA Prefix: 346, Name changed from Iranian Naft Airlines in September 2017. | IR | AVCODES |
| 6480 | NV | Newaukum Valley R.R. Co. | 7/1923-1/1941 | | NAKINA |
| 6481 | NV | Newaukum Valley R.R. Co. | Apr-38 | | NRHS |
| 6482 | NV | NEWAUKUM VALLEY RAILROAD CO. | | | PWRC |
| 6483 | NVA | Nile Valley Aviation Company | | ET | AVCODES |
| 6484 | NVA | Aeroclub de Albacete | | E | AVCODES |
| 6485 | NVA | Nile Valley Aviation Company | | | ICAO1 |
| 6486 | NVA | | | DDR | TRAFFIC |
| 6487 | NVAA | NILSON VAN & | | | SCAC4 |
| 6488 | NVAB | NAVIERA ALBATROS, S A | | | SCAC3 |
| 6489 | NVAC | NOVACOR LTD | | | SCAC3 |
| 6490 | NVAC | NOVACOR LTD | | | SCAC4 |
| 6491 | NVAD | NOVA DELIVERY INC | | | SCAC3 |
| 6492 | NVAD | NOVOSAD ENTERPRISES INC | | | SCAC4 |
| 6493 | NVAE | NOVA AMERICA LINE | | | SCAC3 |
| 6494 | NVAF | NOVA AUTO CARRIERS | | | SCAC4 |
| 6495 | NVAG | Nordfriesische Verkehrsbetriebe AG | Niebüll | D | privat-bahn.de |
| 6496 | NVAG | Nordfriesische Verkehrsbetriebe | | D | TRAFFIC |
| 6497 | NVAK | NOVAK TRUCK LINES | | | SCAC4 |
| 6498 | NVAM | NATIVE AMERICAN TRUCKING COMPANY IN | | | SCAC3 |
| 6499 | NVAM | NAVALMAR (UK) LTD | | | SCAC4 |
| 6500 | NVAN | NVA TRANSPORTATION INC | | | SCAC3 |
