Find a telephone number’s Service Provider  

The provider that offers connection service to a phone number is the original holder of the phone number if the number has never been transferred, or the provider to whom the number has been transferred, in the opposite case. If the provider is not connected directly to NRDBP but through a third party provider only the name of the third party provider is returned.
The search can only be used for 10 digit numbers, and not for short codes (numbers starting from 1 or 54), or 807-series numbers.