| 39 | I0001 | Ice-breaking | B0040 | 390013 |
| 35 | I0002 | Import-export agencies | A0047 | 350005 |
| 44 | I0003 | In vitro fertilization services | F0002 | 440196 |
| 40 | I0004 | Incineration of waste and trash | I0018 | 400106 |
| 42 | I0005 | Industrial design | D0025 | 420049 |
| 35 | I0006 | Industrial management assistance (Commercial or – ) | D0040 | 350025 |
| 38 | I0007 | Information about telecommunication | I0030 | 380027 |
| 35 | I0008 | Information agencies (Commercial –) | A0049 | 350006 |
| 35 | I0009 | Information (Business –) | I0023 | 350065 |
| 37 | I0010 | Information (Construction –) | I0026 | 370104 |
| 41 | I0011 | Information (Education –) | I0033 | 410048 |
| 41 | I0012 | Information (Entertainment –) | I0027 | 410050 |
| 36 | I0013 | Information (Financial –) | I0035 | 360059 |
| 36 | I0014 | Information (Insurance –) | I0025 | 360060 |
| 40 | I0015 | Information (Material treatment –) | I0031 | 400087 |
| 41 | I0016 | Information (Recreation –) | I0028 | 410064 |
| 37 | I0017 | Information (Repair –) | I0029 | 370105 |
| 39 | I0018 | Information (Storage –) | I0034 | 390076 |
| 39 | I0019 | Information (Transportation –) | I0032 | 390077 |
| 35 | I0020 | Inquiries (Business –) | R0049 | 350002 |
| 42 | I0021 | Installation of computer software | I0040 | 420201 |
| 36 | I0022 | Instalment loans | P0001 | 360002 |
| 41 | I0023 | Instruction services | E0010 | 410017 |
| 37 | I0024 | Insulating (Building –) | I0046 | 370054 |
| 36 | I0025 | Insurance brokerage | C0131 | 360010 |
| 36 | I0026 | Insurance consultancy | C0099 | 360055 |
| 36 | I0027 | Insurance information | I0025 | 360060 |
| 36 | I0028 | Insurance underwriting | A0104 | 360012 |
| 42 | I0029 | Intellectual property consultancy | C0087 | 420172 |
| 42 | I0030 | Intellectual property (Licencing of –) | L0011 | 420150 |
| 42 | I0031 | Intellectual property watching services | S0049 | 420196 |
| 37 | I0032 | Interference suppression in electrical apparatus | D0015 | 370117 |
| 41 | I0033 | Interpretation (Sign language –) | I0042 | 410105 |
| 35 | I0034 | Investigations (Business –) | I0043 | 350033 |
| 45 | I0035 | Investigations (Missing person –) | E0033 | 450053 |
| 36 | I0036 | Investment (Capital –) | P0053 | 360017 |
| 37 | I0037 | Ironing (Linen –) | R0053 | 370079 |
| 37 | I0038 | Irrigation devices installation and repair | I0045 | 370053 |
| 36 | I0039 | Issuance of credit cards | E0021 | 360068 |
| 36 | I0040 | Issue of tokens of value | E0020 | 360065 |
| 36 | I0041 | Issuing of travellers' checks [cheques] | E0022 | 360020 |