1, login:/service/querytools/internal.aspx;
2. Choose according to your own situation;
Note: At present, ean International (GS 1) has allocated the prefix code between 690 and 695 to China Article Coding Center for use. Usually, the manufacturer identification codes starting with these prefix codes are assigned and managed by China Article Coding Center; Other prefix codes are the responsibility of foreign GS 1 member organizations, which are generally called "foreign bar codes".