The number portability nation-wide reference database (RNPDB) is a service that serves to all operators in the country as a sole valid source of information on ported numbers.
RNPDB presents an integrated database, to which all operators of public telecommunication networks can turn to in order to find out, whether a certain number was ported, to which operator this number was transferred and by which operator the number has been passed.
RNPDB is not used for the processing of calls or for real-time polling. It is used as means for updating individual databases working in the real-time mode, which are used by all operators in the Czech Republic for number portability.