I have now made the following changes:

pdbt.c:

 bufsize = slen + 1 + 1 + 5 + 1 + 1; // line buffer (telephone number + colon + white space + carrier ID + newline + \0)
 ret = snprintf(p, 7, "%d\n", node->carrier);
           if (ret < 1 || ret > 6) {

common.h:

 #define MAX_PDB_CARRIERID 99999
 #define MAX_CARRIERID 99999
 …
 typedef int32_t carrier_t;

I still get no answer for prefixes bigger than 32767. I have a server with only this two lines :

 0778667682;32768
 0781541867;32767

The results of 2 querys are:

 processing command line parameters...
 got an answer in 0.180000 ms
 0778667682: not_found: comment=''

 processing command line parameters...
 got an answer in 0.155000 ms
 0781541867:32767:unknown carrier

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