What do the numerical codes mean in the search results in the Madrid Express database? These codes are called "INID" codes, which stands for "Internationally agreed Numbers for the Identification of (bibliographic) Data." The codes are documented at Recommendation Concerning Bibliographic Data Relating to Marks. Some of the most commonly used codes are:
| 151 | Date of the registration |
| 171 | Expected duration of the registration (in years) |
| 180 | Expected expiration date of the registration/renewal |
| 300 | priority under the Paris Convention |
| 732 | Name and address of the holder of the registration |
| 811 | Contracting State of which the holder is a national |
| 740 | Name and address of the representative |
| 540 | Reproduction of the mark |
| 511 | International Classification of Goods and Services |
| 812 | Contracting State or Contracting Organization in the territory of which the holder has a real and effective industrial or commercial establishment |
| 821 | Basic application |
| 822 | Basic registration |
| 831 | Designations under the Madrid Agreement |
| 832 | Designations under the Madrid Protocol |
| 891 | Date of subsequent designation |
| 842 | unknown |
| 527 | Indications regarding use requirements |