Hi, I had configured my pdb module to accept 5 number prefixes by doing: In pdbt.c: bufsize = slen + 1 + 1 + *4* + 1 + 1; // line buff er (telephone number + colon + white space + carrier ID + newline + \0) ... ret = snprintf(p,* 7*, "%d\n", node->carrier); if (ret < 1 || ret > *6*) { And in common.h: #define MAX_PDB_CARRIERID *99999* And i hadn't had any problem until now. I had rows in my .csv like: 0645052050;10122 And it worked. The problem I have now is with prefixes bigger than 40000. I get segmentation fault when doiong a query with pdbt, however the pdbt build works good without any error. At first i thought of a buffer problem but eventhough testing with a .csv of 2 rows with 50000 prefixes will not work. Another curious effect is that for a prefix like 84238 the server changes the answer to 18754. I dont know why... Could anyone help me please? Thanks and regards, Igor.