Since February 1996, following the Law on Travel Related Activities and its special regulations, all travel agencies have to display their identification code. The agency is free to choose its activities to be included in the ID code and after that, in its operations it has to abide by the regulations related to the operation for which it is registered. The same ID code applies to the head office and all branch offices.

The ID code consists of a combination of groups of letters and numbers divided by dashes. The first part for all travel agencies codes is the same and consists of letters “HR” for Croatia. The second part consists of one or two capital letters denoting the travel agencies activities:
  • "A" stands for tour operators only,
  • "B" stands for retailers only,
  • "C" for retail agencies providing tourist service or tourist information only
  • "AB" stands for travel agencies providing services of both tour operator and retailer
The third part of the ID code consists of two numbers denoting one of the 20 counties or the City of Zagreb where the head office is registered, and the forth group of numbers contains the identification number (MBS) assigned to the travel agency at its registration with the Commercial Court (for those registered as limited liability or joint stock company) or with the County Department for Economy (those registered as craftsmen).
Great majority of Croatian travel agencies have chosen to register "AB", i.e. for both tour operating and retail activities.