NACE has four levels:

  • First level: 21 sections with letters consisting of letters (A-U)

  • Second level: 88 main groups with two-digit number codes (01 to 99)

  • Third level: 272 groups with three-digit number codes (01.1 to 99.0)

  • Fourth level: 629 subgroups with four-digit number codes (01.11 to 99.00)

SNI and NACE share the four levels which are identical, but have SNI and additional levels called the detail group, with 821 five-digit number codes (01,110 to 99,000)

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