Vi har så langt registrert 19 628 rederier
| Navn | Grunnlagt | | International Tanker Management & Co A/S, Oslo | |
| International Tanker Management Ltd, Monrovia | |
| International Tanker Management Norway A/S, Haugesund / Oslo | |
| Interresentskapet For Sydhavsexpedisjonen, Arendal | |
| Inter Road A/S ,Bergen | |
| Intership A/S, Hareid | |
| Intership West A/S, Hareid | |
| Int. selskap Hebe v/ L. J. Dahl, Tønsberg | |
| Int. selskap St. Joseph v/ Ths. Løvold, Arendal | |
| Invest 2000 A/S, Larvik / Oslo | |
| Invest A/S,Oslo | |
| Invest Corp A/S, Oslo | |
| I. O. Falck, Grimstad | Slutten 1800 tallet |
| I. Olsen, Ullerøe, Spind | |
| I. Parelius, Trondheim | |
| I. P. Brodahl, Stavanger | |
| I. Pedersen, Arendal | |
| I.P.G. Passenger Lines A/S, Fyllingsdalen | |
| I. P. G.Shipping A/S, Haugesund / Bergen | |
| I. Ph. Holst, Grimstad | 1850 tallet |
| I. P. Jørgensen, Kristiania | |
| I. P. M. Petersen, Kristiansand | |
| Irano Shipping, Bergen | |
| Irgens Larsen A/S,Oslo | |
| Irgens, M., Odda | |
